I think the reason it keeps coming up is that many parents come and go on this board. So, new parents come on to talk about the atrocity.
Here are the facts. Some teams are much better than others. Parents who want their kids to get the best coaching possible are going to move their whole families to these schools. It is going to happen. If you are upset about it, I would suggest getting over it or working harder with your teams Coach to improve your program that they are leaving.