I use to fund the hobby by buying a machine that needed work for a respectable amount, shop it and repair it then re-sell it for a small profit. Today people have non functioning machines typically listed with something like, “Probably a blown fuse or minor power supply issue” and expect they buyer to pay full if not over value prices. (See it from pinsiders on here all the time). Side note: If it’s a minor issue and an easy fix, then fix it! Otherwise you are be deceiving and/or outright lying.
I would say the only way now is to have the expendable cash.