Yes, it is a good question as to how much your parents can afford, since you describe them here as being in the “highest income bracket.”
http://talk.collegeconfidential.com/what-my-chances/1899844-chance-me-i-chance-back.html
I’m kind of curious as to what it is in your background that you think fits Posse’s mission of “The Posse Foundation identifies public high school students with extraordinary academic and leadership potential who may be overlooked by traditional college selection processes.”
Why would you have been overlooked by the traditional college selection process?