I think it could be a fun retirement gig, where you do it because you want to, and any dough you make is just a bonus.
One thing I am always reminded of is that whenever I do a project, especially for the first time, whether it's building a deck, a fireplace, smithing on one of guns, re-plumbing under a sink, my wife always says, “You could do that for money!”
No I couldn’t, because usually I can only figure out one way to do every project, and if the customer wants it different I can’t accommodate them. And then I think about how much work I put into some fairly banal projects, and how little I’d probably get paid for it, and how I would react if the customer decided in their infinite wisdom that it should have been done differently...
You get the picture.