The thing here is (or one of them) that you probably could do most of the servicing/maintenance yourself with a bit of mechanical aptitude and some spare time. The M3 is much the same as most other cars in most respects, just with (some much) higher parts costs which will be dependant on what you buy and where from. Another thing is that the car will costs ~£5k to buy for a half decent one. It's not like you'll be losing a massive load of money doing it yourself anyway, and come resale time if you keep it a few years yes, you'll put off a far few potential buyers, so you will have to adjust the asking price to account for this. In turn this'll mean that an even bigger knuckle-dragger will turn up to buy it, but you know what? Who cares!
A BMW isn't some mystical beast that requires an undertanding of some ancient magical rituals in order to work on.
A BMW isn't some mystical beast that requires an undertanding of some ancient magical rituals in order to work on.