i agree that the person should not get the entry fee back. especially if they quit and go to a different team! i had a guy do that to us this year too.
my teammates and i have all stated that if you have to back out for whatever reason, all we can try to do is find someone who may be willing to pay the entry fee to bowl at such a short notice. if we do, then that person gets their $ back. if not, then that person is out the entry fee.
the person who quit the team has to realize that if you find a new person, it could cost the sub enough $ already to book a flight/hotel and anything else that comes up on this short notice. now if the sub and the person who quit wants to work out a deal on how any winnings are handled, that is between them.