The performers are quite protective of their territory. I saw a short film about a guy who dresses as superman in times square, taking tips for photos. He got quite upset about the idea of other people just turning up and trying their luck, said he and the other superheroes would basically drive them out.

He took the job very seriously, priding himself on remaining in character and having a full knowledge of the superman mythos, and being able to engage with kids/fans and make them happy beyond just the photo. He got quite offended at the idea of other people turning up in a rented superman suit and not bothering with any of that.

Interesting film, interesting guy. Wish I could remember the title.

EDIT: I found it. Looks like he's not in times square, rather somewhere in california: https://www.youtube.com/watch?v=Jxfbsd-8CIw