I think all of this has a lot to do with wanting to reward the kids teachers like--and those are the bright but not bored kids. (Or if they're bored, their personality is such that they don't act out to show their boredom.)
I can say this because I WAS that kid, and I was rewarded for my teacher's pet behavior time and time again. But I was probably MG, I think, certainly NOT PG. And the boredom just turned me into a perfectionist, so even with the rewards, it wasn't good for me.
It's a darn shame educators and administrators don't understand GTness better! Rules like these are ridiculous.
