@Sovereign said:
The problem comes when the clique is influential enough to be a detriment to your play experience.
All people have influence on your play experience; this is kind of the point. If you don't want anyone to influence your play experience, you'll have to find ways to push them out while getting what you want, thereby becoming part of the problem. Or at best, becoming that group of people who hangs out in their rooms while everyone else goes about their role-play lives.
I prefer to join play-groups, people who are interested in play without being exclusionary. As much as people demanded that The Menagerie, a Changeling motley on Haunted Memories, was a clique, we never excluded anyone based on anything but perhaps their in-character actions. At least, not that I knew. That's the kind of protective group that I think is healthy, people you trust and enjoy their company.
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edit: While thank for the upvote, Ghost, I realize I have one more thing to add: I have played on games where a clique has control of the game itself, or the sphere for that game which is close enough. I have seen @Eerie escape this by playing with a different sphere, but I am not that good with social maneuvering and my options usually end up being "take it" or "leave the game". If this is what @Sovereign is talking about, I get it. This situation is a failing of staff, and I've watched it on games where the clique was staff, or staff refused to address the issue that players were dominating the game in a non-helpful manner. There's almost nothing to do in this situation but, yeah, get out or make your own fortress.