Both are valid points. And, I make fun of DJs who play the same set over and over, night after night. I don't understand why any DJ would subject themselves to

Both are valid points. And, I make fun of DJs who play the same set over and over, night after night. I don't understand why any DJ would subject themselves to that kind of tedium; but let's be honest: the majority of DJs are not musicians, and their interest in music is not deep or wide. And, being repetitive is not a negative in the mainstream DJ market. Regardless of my preference for variety, the people hiring DJs generally don't care about that metric. My favorite DJs in the market where I've worked were playing really obscure stuff for their whole set...but weren't making a lot of money doing it. But, it was clear that they loved the genres and artists they were playing.