PG rankings can be very useful as door openers. But you still have to walk through the door yourself.
When college coaches get reliable information indicating someone is worth looking into, they tend to follow up. That info may come from a trusted high school coach in a particular area. Or it might come from a PG ranking and profile.
Coaches know you can't snow your way into a PG ranking.
But if, upon coming to look into a player more deeply, they don't like what they find, then the ranking merely provided an opportunity that was squandered. This is why a player must understand, he has to bring it every day, every play, every pitch. Someone is watching you on the field. And someone is looking at your grades and SAT's as well. And someone is asking about how you behave yourself, are you a problem, are you a leader, etc.