I think Philly is just the best place on a map. The sport is not huge below NoVa yet, So Philly is just the right Drive for people to go North and South to get there for Tournaments. As for the players signing from there its the "eyes on " theory. If there is a couple studs that get the eyes looking the ones around the studs look better and benefit from being seen. This is why we all pay the money to play for the best teams. Because everyone knows the best players are not always who get the spots.