[Single Wing 77]

Most kids leave for playing time
Most kids leave because they think they are better than they are
Most kids leave because parents think their better than they are
Most kids leave because of girlfriends
Most kids leave because they aren't good enough to play on team they left
Most kids leave because parents think it's better everywhere else

I read where a south laurel kid scored a perfect on act test, most schools around are good if the kids try

Most kids can't leave for six different reasons. You're list is contradictive and clearly shows your ignorance.
However if a kid isn't "good" enough to play yet he goes to a better defensive team and starts or plays a lot it says something. It sounds like MOST people in MOST schools start because of their last name, or MOST of the coaches at those school don't know how to evaluate, develope, and Coach talent.