Different population when you look at talent searches. That's a demographic that inherently SHOULD be (mostly) naive with respect to the test vehicle.
Prepping means that they aren't. It also favors families from higher SES who can afford/invest in such preparation.
Well, what's the point of having high status if not to benefit your children? My wife and I don't care about luxuries. I helped my son prepare for the SAT using books from Amazon in the $20-or-less range, and such books are also available in public libraries. So my son's "unfair advantage" was having a father who is good at and likes math. Other children have parents with passions for sports, music, drama etc. and are advantaged in other ways.
Having your child score at a certain level on the SAT can give you and him confidence that he is ready to study advanced subjects, and education can make people more productive. So SAT preparation is not a zero-sum game.
