So, these sites have never helped ONE kid get noticed by a school (and, therefore, the education it provides)?
Let me make this clear, in case it was not earlier.
Scouting services, which the schools pay for, notice a lot of kids. I'm sure that helps, but that is different that putting a young man's innermost thoughts, his family issues, grades, etc. online for the world to see.
Pimping the kids out to the general public does not have the same effect as a scouting service for coaches. So no, they don't help a kid get noticed when they post his stats, bench press, SAT, grades, and other info online. These are not race horses. They are people, most of whom will be no more than amateur athletes. And it is not as if these hype machines do anymore than follow conventional wisdom about talent. So no, compared to the invasions of privacy, the commoditization of young men, and the fact that 50 year old men stalk 17 year old boys to find out where they will go to college, no, they aren't worthwhile for the general public. Of course, it is all legal but you've heard why I won't subscribe to these things.
To some extent, the Scout board provides detailed information about what is happening on the coaching staff, practice reports, etc. I can understand that, and think it is useful, but I dislike their general business model enough that I would never knowingly give them money.