Whoa, that's actually hard to answer.
Obviously, I map for fun. I enjoy the music and have fun interpreting it in form of a map.
But let's be honest, I also look forward to getting my first map ranked. That way, more people can play - and enjoy - my map, which in the end will make me happy.
Additionally, having some people know you as a mapper isn't a bad thing either.
Oh yeah, and I think experience in mapping does help a bit for playing as well. If you are a mapper you can understand other's maps easier and eventually have an easier time playing them.
I think I'll go with"Other", because fun is still the most important thing about mapping. (Why isn't fun an option in the poll anyway?)