The Death Metal scene has pretty much no sell outs. There are a few examples, but it is definitely a community where selling out is the worst thing you can do.

I'm not talking about a hippie commune or something, but that in some subcultures it is actually a thing people mentally struggle with and make decisions with more emphasis on principal than money. Another commenter gave the example of death metal, which is a good one because music and art in general are where I see the attitudes the most.