[4throck]

On 1418, as has already been commented, we have absolutely no grade requirements. In fact, our leadership has a long and proud history of underachievement in school. High school does not in any way shape or form (except perhaps workload) prepare you for the real world. The purpose of FIRST is inspiring and recognizing science and technology, and high school rarely involves either.
Saying that FIRST teams should have a grade requirement has a fairly fascistic ring to it. You are forcing kids to jump through the hoops of a educational system that is broken for those who would really need FIRST in the first place. Hell, I'm going to a liberal arts school next year, and I still believe that FIRST was the most worthwhile thing I did in school.
And finally, who cares about high school GPA after you are in college? A business will check your college grades, but certainly not your high school transcript.

Just my $0.20 (I am 10 times more valuable than most)