Cimorene,
Firstly, show up as early as possible. They've raised the player cap to like 760 or something for the Seniors, but still, don't risk it. Philly had something near that last year. :/
Secondly, last year, they gave out 2 free plane tickets, and a room for 2 for Worlds. It really sucked that literally NO ONE was able to come with me last year (terrible, TERRIBLE time of year for my family) x_x, but they STILL payed for both tickets and such. And also, if you wanted to bring more people (which a LOT of Worlds 09 People did), you just had to pay their way, although you got the exact same group rate that TPCi did, so it wasn't that bad.
However, IIRC, they changed it this year. ONLY the top 8 or so Juniors get 1 ticket for them, and 1 ticket for a guardian, and hotel for both, and ONLY the top Seniors get 1 ticket and a hotel for themselves. Anything else YOU have to pay for.
Honestly, that's still not bad at all, but, meh, it kinda stinks compared to last year IMO.