If you look at the mass of published fiction in bookstores....isn't the majority of it repetative and lacking imagination? And then there are a few novels (maybe only one or two a year) that lift themselves up from the crowd and are really something special? Movies...the same way. Film after film duplicate a prior success...cloning endlessly, and then something special appears and blows the competitors out of the water. In any endeavor, you have a mass of the average, and then one or two spikes of brilliance, and in between, some above average works. This is natural. I don't know why the galleries would be any different. In fact, the galleries hold true to form for the rest of our society as far as I can see.