I think it's a balance of pressure versus expectations. If you are on a team, it is expected that you have some/all of the skills necessary to be on a team. If you are no longer performing the skills, it is expected that you might lose your spot. Parents always talk about how cheer is a business and if they aren't getting their money's worth they're free to leave, well that goes both ways. If the coach isn't getting the thing they need from you, they will get it somewhere else. When I played elite volleyball, I had to deliver my skills. If I didn't, I wouldn't get playing time. In cheer, that translates to being on said team. I've seen the Jtv videos where CSP gets mad at someone. She is always much nicer to them than some of my coaches ever were.
Who knows? Maybe I've been bullied by them. I've been bullied by kids at school, but that's always been much easier to identify..
Where's the line? Any coaches on the board want to chime in? (Shall we create a new thread?)