Funnily enough, back when I was doing improv at school/university, I've found a great portion of the people there to be among the most self-absorbed people I've ever met. A lot of them were genuinely funny people, but there was a lot of ego, tribalism, people wanting to be stars, etc etc. It was actually one of the reasons why I got scared out of continuing in a local league after graduation, even if I'd done it for four years and thoroughly enjoyed it.