its bloody obvious what I am getting at Bryan,
if one person the organiser[there is no committee] is responsible for paying the guest,he is responsible for getting people in to the club,if he feels putting a bad singer on is likely to affect the numbers of people coming into the club,and thus his ability to pay the guest,he has every right to refuse a singer ,it is in effect his club,because he is financially responsible,he / she can also determine what rules as regards manners,are enforced at the club.
the fact that i would allow a low standard for floor singers to sing,does not mean that they are not open to improvement[as we all are, myself included],
a lot of the singers I would allow on,would benefit from going to workshops.