CPLZ,
That was one of my pet peeves as a coach, having a player quit the team to go to "greener" pastures but as long as it was done with class I didn't mind. The fact was that for our area we only had a mediocre travel team and didn't try to compete against the top teams except in local tournaments so we had to expect the players who were focused on winning to go elsewhere.
Now when we had some players quit a couple days before a tournament we'd already committed to because they were unhappy about playing time (I was only carrying them out of loyalty) I wasn't too happy as that left us without enough players and I had to scramble to keep from having to pay the entry fee.