I&'ve had a checkered relationship with OpenTable. Initially, I loved it as a user, then was let down as the service evolved. For instance I found the eat-at-100-restaurants-and-get-a-measly-$20-check rewards system slightly better than a punch in the face and was annoyed that restaurants still required me to call to verify a reservation. If I had time to make a phone call, I wouldn&'t have used OpenTable. Duh.

I&'ve vocally accused the site of tailoring its service too much to the restaurants&' needs&8211' who after all pay the bills&8211' and ignoring a better customer experience. (Once a customer service rep for OpenTable actuallya4s��told me they only cared if the restaurants were happy.) Then, the company addressed a lot of my issues, for instance offering easy ways to get larger numbers of dining points, and the CEO Jeff Jordan and I sat down and hashed it out in a video interview and I came away more impressed with him and the company&'s management generally.

Lately, a diner like me isn&'t the one doing the bitching&8211'it&'s restaurants. Something strange has been happening in San Francisco, which is OpenTable&'s home market and oldest market. I dismissed it all for a while as purely anecdotal: The half-dozen or so new hot restaurants in my neighborhood that didn&'t use OpenTable, the scattered emails from restauranteurs asking my opinion on whether the service was worth the money, based on how vocal I&'d been about it in the past. Then yesterday we got this in the TechCrunch Tip jar: A reasonably-articulated, scathing rebuke of why a local restauranteur named Mark Pastore doesn&'t use OpenTable, and how he thinks the service&'s success has robbed restaurants of their most valuable asset, the relationship with diners, and charged way too much for thea4s��privilege. Even if he&'s a lone squeaky wheel, it&'s worth a read if you&'re a regular OpenTable diner, investor or would-be competitor.

At the core of his argument is the belief that OpenTable&'s $1.5 billion market capitalization isn&'t a result of creating that much value for the market as a whole' it&'s largely taken it from thousands of mom and pop restaurants. Pastore did a survey of his friends who were also restaurant owners and only one said that he felt OpenTable actually increased the value of his business. Tellingly, most of the others use it and don&'t plan on quitting&8211' but not because they love the service, because they are terrified of disrupting how diners are accustomed to making reservations. It turns out OpenTable is an astoundingly sticky business. It&'s billed as a modern pay-only-as-long-as-you-love-it cloud subscription business, but Pastore&'s description sounds like what most on-premise enterprise software customers would say. (Paging Ben Horowitz&8230') This puts a whole new spin on why OpenTable was growing as restaurants over all were losing money.

The most devastating blow is Pastore&'s economic break down of what OpenTable costs restaurants:

&''The access fees can be substantial, particularly for restaurants operating on thin margins. One independent study estimates that OpenTable�a4���a4�s fees (comprised of startup fees, fixed monthly fees, and per-person reservation fees) translate to a cost of roughly $10.40 for each �a4���Aincremental�a4���� 4-top booked through OpenTable.com. To put that in perspective, consider that the average profit margin, before taxes, for a U.S. restaurant is roughly 5%. This means that a table of 4 spending $200 on dinner would generate a $10 profit. In this example, all of that profit would then go to OpenTable fees for having delivered the reservation, leaving the restaurant with nothing other than the hope that that customer would come back (and hopefully book by telephone the next time).&''

Most restaurants suck up the cost to have the competitive edge of easy bookings. But with so many restaurants all using the same system&8211' is it really much of a competitive edge or is it just table stakes Pastore cites one 3.5 star restaurant in San Francisco where the owner has spent years paying OpenTable substantially more than he pays himself for 80-plus hour workweeks. When the economics are that lopsided, one would have to start wondering exactly how many diners wouldn&'t book directly on a restaurant&'s site if that were the only option.

Here&'s the stunning thing this post made me realize for the first time: Unlike most large Web companies that built their businesses on cutting costs out of an industry and eliminating middlemen, OpenTable has managed to do the exact opposite. It has created a new middleman. So is there room for this new middleman to be disrupted

It&'s not going to be easy, as Pastore&'s own survey shows. Restaurants are terrified of getting rid of OpenTable and sending diners to another restaurant that still uses the site. And this is a hard, pounding-the-pavement business to build. It took OpenTable a decade to get to any kind of critical mass and it still provides software for less than 15,000 restaurants network-wide.

But there are ways to disrupt some of what has made OpenTable powerful. As Pastore argues and I&'ve seen increasingly in San Francisco, a lot of new restaurants try their own online booking systems first. Theya4s��mimica4s��the convenience that OpenTable proved customers want, while keeping control of the relationship with the diner. It&'s similar to what you saw in the travel industry: Early online travel agents proved people wanted convenience to book online and airline and hotel companies didn&'t want the headache of building a site. But increasingly, they&'ve all been trying to send customers to their own sites, either directly or through an aggregator like Kayak.

There&'s also clearly a role that Yelp, FourSquare and Groupon could play as spoilers. As a diner, I usually go to OpenTable to browse what restaurants in a given neighborhood have availability. It&'s less for the transaction of making a reservation itself. There&'s definitely some overlap when it comes to on-the-spot browsing with Yelp&'s mobile app, and there&'s no reason FourSquare couldn&'t use geotagging to push a list of restaurants witha4s��availabilitya4s��to you. (Yelp&'s past partnership with OpenTable doesn&'t necessarily preclude something like this.)a4s��If they don&'t provide the back-end software, they will never have the same inventory that OpenTable has. But so what They won&'t charge restaurants as much either. That might be compelling enough.

Likewise, I wouldn&'t be surprised to see some restaurants experiment with using Groupon to drive diners to them instead of paying OpenTable&'s monthly fee. They get someone to come in the door once with a hefty discount, but it&'s a one-time expense. You could even see Facebook Pages playing a role here. In general, the iPads, iPhones and Android platforms give would-be competitors powerful new tools to challenge OpenTable, which players like UrbanSpoon are counting on. Designing an app from the ground up to take advantage of how far the local game has come with location-aware smartphones is a world away from OpenTable&'s DNA as a circa-2000 Web and back-end software company.

And really, all these players would have to do is erode OpenTable&'s ability to sign new customers to have an impact. This earnings report was good, but the company&'s shares have jumped a staggeringa4s��230% since its IPO 18 months ago, trading at a price-to-earnings ratio eight times higher than the Standard &' Poors index. Bloomberg reports that short sells are increasing and some analysts call it the most overvalued stock in the sector.

When you&'re priced beyond perfection, it doesn&'t take much to stumble. Maybe OpenTable should listen to the squeaky wheels out there once again. CrunchBase InformationOpenTableInformation provided by CrunchBase