I chart a decent amount for osu!mania, albeit mainly stupid tournament warmups, but on occasion it's a serious thing. I'd probably do it more-so if the editor wasn't to be so annoying to use, yet that's why I'm anticipating osu!next.
Trying to find willing playtesters is a pain, though, without trying to annoy people.
I tried mapping, but I never submitted it. I've seen how some high-profile maps that I'd call absolutely flawless get unranked again and again, so as a complete newbie what chance do I ever have of getting something ranked? It's a complete waste of time, so I'm not sure if I actually want to map anything.