These 3:
Nail it. If I'm not at BlizzCon, I buy the virtual tickets. I find it to be worth the money because I want to be watching stuff LIVE. I want to WATCH the announcements as they happen, not read them or watch them later. It's a fun hype thing, something I greatly enjoy. On top of the 2 day entertainment, I also get in-game goodies, that you can't get elsewhere.
So, between the fun and the goodies, to me, it is worth the money. I can understand why it wouldn't be for some, why can't you understand why it WOULD be for some?