Then they should be publicly run and free to take and send to universities.
(Yes, it takes time and commitment but it's mostly not the case that paying for test prep courses automatically translates into higher scores.)
And yes, money helps a lot to brute force what material works for a kid and get motivated teachers. It's not a magic bullet, but it's a lot better than no bullet.
Education is free and freely available.
"Maximize your score with free Official Digital SAT® Prep"
You should probably get that checked out.