Yeah, it's kind of a big hoop to jump through (especially when you can just pay $100 now to get your own ticket anyway). But then again, tickets are going fast (I got mine the other day), and if you're planning on going to the event in Dallas anyway, it's a nice bonus. Interesting that they're giving it away to a lucky 3v3 guild-- maybe they need more of them to fill out the brackets? If you're interested, register an account on the WSVG site, sign up for the event when you're logged in, and then you've actually got to show up to the event to be eligible.
We'll keep you updated on more giveaways as they come along-- WoWWiki has already given away a couple of tickets to their own contributors, and we're sure there will be a few more in different places in the days to come.