[quote=@tex]
People lose interest, that's the most deciding factor. Sometimes it becomes a chore to write if people become less engaged, which is why I try to get people to contribute to the universe, and become invested, so that they really feel like they're part of something.

I want to emphasize that there is no 'post expectation' for this RP. 1 paragraph, 5, 10, idc. As long as you can convey what your character is doing and feeling, it's all good here.
[/quote]

I think one of the big keys is for players to feel like their character matters. I've never felt more disengaged from an RP than when I feel like I've been railroaded, and my decisions don't matter, you know?

I had a faction RP I was in once with a pretty good GM, and everyone had an impact on every individual scene, but at the end of the first arc I realized that the overall plot for my group had been largely unaffected by us and I had no motivation to go into the second arc.