I like the idea of performing tasks for my Master for money for it's debasing and humiliating aspects but I would have trouble asking him to do it... I don't have a job and I don't want to think I'm just trying to milk him for cash to support my beading habit or something like that.
I will, however, suggest to him that cash values are assigned to some tasks that I perform for him and a log kept of those gains/losses (if i act up) so that I can earn money for new toys for us to use. That way we both get rewarded.