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I would be very careful if you do decide to buy a scalped ticket. Apple made it clear that tickets are nontransferable, although I'm not sure how they are going to enforce it. I guess they could just check IDs, come to think of it. The point is that you could spend a lot of money and then be denied admission to WWDC anyway. That would be a pretty expensive bummer.
As to the question about is it worth it, I guess it depends. Sure aside from developers discussing actual development and learning the details of new OS, there is an aspect of rah-rah. But who wouldn't have wanted to be there when Steve Jobs announced the iPad, or seen that moment when he pulled the first iPhone out of his pocket?