I lost my enthusiasm in the last few years as well. I spend all day doing machine work and engine building for others, and literally never touch my stuff anymore. Almost all my cars, engines and parts have been/or are for sale, but no one else seems interested in them either. Rebuilding a 69 hemi dart for a fabo member and getting vastly shorted on the money helped seal my desire to avoid anything other than machine work.
Kind of like, a painter's house is never painted. My take on this is, why work for free, when you can work and get paid. Remember, what you do to your ride or whatever to improve it, will come back in dollars when you sale it.