Frustration

For me, it's electrical stuff. I've got 2 projects (both were drivers) that are sitting because of under-dash electrical problems. I can't justify doing any of the fun-stuff (body/paint) untill I exorcise the electrical demons.

Don't do it for the money, you'll be a loser every time. If you don't enjoy it, don't work on it, it'll just make you more depressed. When there is something you want to do to it, do it. I wouldn't spend $15k on bodywork and paint, but that's the stuff I enjoy doing. I'm seriously thinking of paying someone to instal 2 new wiring harnesses, but I'm just too dang cheap, so I'll get to it when I get to it.