The band I've been with for a great number of years plays mainly for fun. We do a quite a few performances to benefit various groups (no money there), however, we usually recover some of our expenses by selling a few cd's. Any money we make from cd sales is divided equally among current band members even it they were not involved in making the cd. I feel it is only fair since doing a benefit is an expense for the performers whether or not they were involved in making the cd.
        Only one member of our band involved in making the cd has moved away and could care less since there isn't any great amount of money involved.
        I suppose if you are playing to make money it would be advisable to have some type of contract agreed to by all members involved in making the cd.   
Cap't Bob