Okay, it's the extremely rare tip of a much larger, less extreme iceberg.
There is also the possibility that people hothouse high-MG into the HG+ category, as well. So perhaps the hothousing thing is a less pathological version of what Chapman's mother did.
But IMO, a serious side-effect of the problem is that IQ coaching can populate gifted programs with kids who aren't gifted and also skew perceptions of giftedness among teachers. They're told that the kids in the program tested as gifted, and it's reasonable for them to believe this. If many or most of the kids are very bright but not gifted, it makes things harder for the ones who really are gifted. And of course, all the prepping is presumably inflating the numbers of kids who qualify for these programs, forcing NYC schools to resort to lotteries and other methods of admitting kids, which, again, makes admissions that much harder for the kids who need the programs the most (and for whom the programs were ostensibly designed).
