At this point in the process if you haven't purchased a ticket you most likely aren't going to be able to attend this year. That's the unfortunate news. The good news is that all hope is not lost! There has already been a second chance re-sale, but it will not be the only one to come. Some time after May 15 when your opportunity for ticket refunds is officially closed there will be one more resale. Unlike the first, this upcoming one will most likely have a much larger batch of badges to offer. In years past this resale has occurred rather close to Comic Con and each badge type was released in separate batches. There has been no definitive information as of yet, but from what I've read and through my experiences with the current ticket process I believe that they will release all of their available badges at one time. Be sure to keep your eyes peeled for more news!
-Mitch
-Mitch