The reason to go to WWDC for people who attended before is close to zero now that they stream live sessions and put them online very quickly. Not worth the 1600 + hotel + flights.
I agree - there is no reason to go now unless, say, you have a small company and want to network, or need person-to-person time with Apple engineers on code issues. Or your company is paying and you want a vacation - San Francisco is a great place to travel to.
Yes, the food is maybe worth $10 a day (croissants, donuts, boxed lunches), the party may be worth $75, the merchandise maybe $75. Still it's about $1400 more for the rest of the conference. Plus Flights ($800), Hotel ($1500) - a lot of money.
I can now pay $0, take the week off at home, watch the videos online, and my company will have no problem with this expense.
Oh, if you REALLY want to see Tim Cook or Jonny Ives, or anyone else in person (at the keynote if nothing else), then it is worth it to go one time. I really wish I saw Steve Jobs. When I went in 2009, Steve could not attend because he was sick - he did attend in 2008 and 2010, which I did not go to. But I saw Woz and other Apple top dogs. That was cool.