It is always better to go as a couple. There is a definite hierarchy with single men ranking at the bottom, just below pond scum. When these places allow single men, there are always lots more men and they usually get frozen out by the couples, particularly at off premises clubs like the manor. On premises clubs seem to be different. Many of the couples that go there on single guy night are really into it and the guys have a better time.
I was at Encounters last night. There were a few couples, but only one was playing. This lady is a regular and she loves to suck dick. When she is there, she is a sure thing. I got a BJ and some guys got 2.