suposedly the directors picked members from the top 10% of there corps, and sent that list to dci who then figured out instramentation and sent another list back for the directors to cut down, obviously they couldnt take 10% of every corps. which also brings up the size, part of the reason, is we were useing bostons equipment... which cuts you down to, at max, a div one sized corps. also alot of the people who were invited decided not to go, being that it was close to finals, and during the week, and only 18 and up were suposed to go and also, it cost anywhere from 2-350 bucks, which is the final question, we were all on our own, but it included 3 day park hoppers, disney "resort" hotels.... and some nice food vouchers, as well as our dci goodie bags.
hope that answers your questions