yeah, it does not seem that any of them are rich from stringing. the figure is prob pretty low, but they don't mind because it is something that they enjoy doing. i can only imagine that there are some pretty cool perks like traveling the world and meeting some cool people. don't know if that is of any help, but just a thought!
Unless you're single and have NO bills, you aren't going to make a living at it...unless you're a personal stringer to a top pro. And then you had better not have a family, because you won't see them much.