Oddly enough, I have both a 1996 pinball machine and a 1970 muscle car. Not that I'm arguing the maintenance on either is easy, but they are not expensive -- probably under 50th percentile as far as hobbies for Americans go. Both have low or negative depreciation, and $100-$1000, plus 5-10 hours of my time, per year.
Hmm, I have a 1980 Williams pinball. I took care of some 'deferred maintenance' when I bought it 12 years ago, but since all I have needed to do was clean/wax the playfield and change an occasional bulb. Since it was designed for commercial use and now is strictly home use, once restored the ongoing cost is not much more than electricity. Due to appreciation I should be able to sell it for more than all the $$ I have spent on it.
My cars, OTOH, are much more expensive to keep around. Local ordinances require all vehicles to be licensed or stored in a garage. And licensing requires maintaining insurance. Because somehow an unlicensed vehicle lowers everyone's property value. I swear, one of these days I'm going to buy the ugliest car that I can find that will pass a state inspection, and park it on the street in front of my house. I'm thinking something along the lines of a Yugo with a rattle-can paint job.