It seems the iPad 2 isn't the only thing fetching a premium online. A short supply of tickets for Apple's sold-out Worldwide Developers Conference in June has led some people to sell theirs at a premium.

A quick check on eBay at the publish of this post shows 10 such listings, though as of yesterday, more had been available prior to being sold. The one ending soonest is hovering just north of $3,000, while Computerworld reports that one posted earlier this week was listed at $4,599, both well above the original price of $1,599.

WWDC is Apple's annual event for developers, and kicks off June 6 at Moscone West in San Francisco. At the show Apple has said it will give developers "a preview of the future of iOS and Mac OS X." Though knowing Apple, there could be a surprise or two. Within 10 hours of going on sale Monday, Apple halted WWDC ticket sales, saying that the event had sold out, making it the fourth consecutive show to run out of spots.

Worth noting is that online buyers who want a ticket can't be just anyone. Apple's system requires that WWDC attendees be a registered developer with the company to activate the code that was given out to those who managed to snag tickets. That code is what's being sold as part of these auctions. Even then, such a detail is unlikely to stop someone who's willing to pay double or even triple the price.