The issue was/is, Canty coaches were saying to players: "if you play for my club, then you've got a better chance at making the Canty team". It definitely did happen during my time coaching and lost kids to one particular club.
Perhaps not an issue now, as I thought Canty coaches have been told they aren't to say these things anymore, but it does seem odd that whole Canty teams go to one particular club. I mean look at the Mainland Pride for god's sake! :-)