tony, those acts are what i'd call second-tier tribute acts. they are professionals, they tour constantly, and as far as the club is concerned they draw decent crowds. these aren't garage bands or bar regulars who learned to maul "stairway to heaven" and "black dog".
both super diamond and BSO hit the club about once a year, but other than that michael jackson tribute act that comes through i can't think of any other cover bands that play the 930. three a year is acceptable, just a coincidence that we had two of them so close together. hang in there.