One regular occurrence which still angers me to recall it, was when a performer would turn up at the desk of the Club, ask for a spot, then ask whoever was on the door to give a shout when it was their turn, not even bothering to find out what the club did.
In my experiences, decent clubs have some sort of policy and tended to do what it says on the tin.
If performers can't be bothered to find out what that is, they shouldn't be asked to perform on principle.
As far as how many songs anybody should be given, that must be the decision of those running the club.
If you wish to change to that decision, become part of the organisation.
Complaints about it should be FILED FOR FUTURE REFERENCE
Jim Carroll