Well, the roleplays mainly have a cycle of flourishing, and then just suddenly dying. (With maybe some or even half of them being revived occasionally.) Think of it like the Chinese Dynasty Cycle!
I have NEVER seen a roleplay that was finished here to the 100%, where it was deemed to be complete and required no EXTRA postings. (I have done it before with others, but I'm not sure if it counts since it wasn't on this site. It was done over the span of six months, and I just finished it with only my friend weeks ago...)