I agree that "it's about those people in front of you being entertained and happy". I personally try to keep songs simple because i think that keeps the people happy. But i have found that once or twice a night, at least, the crowd likes a show off tune.
But. . . I have also found that the technique or the tune that the crowd thinks is a show off piece is usually some simple little trick that is easy to pull off.
So i satisfy their need to hear "some fancy playing" because of the ovation i get from them. It's keeping them happy.