It is always hard to buy WWDC tickets because they sell out within minutes. This has happened in the past and this year the policy has been changed. Apple offered developers tickets this year via a lottery system.
Everyone who was officially registered with Apple devs programs could try to win the ticket. And now, as reports state, the company gives a second chance to some people who weren’t lucky to purchase WWDC tickets for 2014 event. The iPhone maker emails these developers offering them $1,599 tickets if they pay within 24 hours their fee.