I just see Bill figuring out though, in the entire "I WANT TO BE WARM AGAIN" outfit, gets a little okay with it when he finds out that he can curse out people without them knowing (Like Kenny from South Park). That is, until Stan finds out by listening in, figures it out, and then the swear jar gets filled until Bill reluctantly stops.
Still, it would have been worth it just to be able to curse around Stan and everybody without repercussions for a while. Without anything to spend money on, it may even be a good way to waste his paycheck away XD