I tried to start an rp once (well twice now.)
But then I took an arrow to the knee.
*an arrow flies from somewhere offscreen and hits me in the arm*
>.>
Anyways.... It's not worth the effort. Controlling the strings takes too much work. Both times ive attempted now I've gotten either tons of bites and nothing on the ooc, or no bites at all. It sucks. Stemming off of this on the topic of making cs, I hate to feel like its not good enough or its too good when i spent oh, maybe a few hours on a cs? and the things they may point out to you as being too unusual for a character they put on their own... bleeding hypocrites. I may just leave an rp now because that happened to me. 
I find I either leave rps because it dies or, for the first time, because i felt insulted.