This. Dave hits the nail on the head. No matter how low you set your sights, you can never underestimate the musical perception of some punters. Listen to any non-specialist commercial radio station and yes, you will hear Kylie, Guns n Roses and Depeche Mode all on the same show, so why should people expect any different from a covers band? OK, it is a bit different for originals, but then again, if you are playing to people who haven't specifically come out to see you play your music then, again, there will be those that have a completely different perspective on music than we do as musicians.