Great thread! Too bad there are no M cars. Imagine if there was an E30 M3, E28 M5, or an E24 M6! I'd bet someone would pay 80K for a brand new 20 year old M car.
As far as the maintenenace on the car, I can't imagine anyone buying it and actually driving it, so its probably a non issue. I sure wouldn't pay 80, and then rack up the miles on it. If I wanted one to drive, I'm sure there are plenty of well maintained ones out there for a fraction of the price. Who ever pays 80K for it is likely going to stick it on dispaly somewhere...That said the "bubble" E30 M3 ended up as a track monster!