They can be costly. For the first two years my SDL was bleeding me for $300-$400 in parts a month.
That was fun!
Not that I read the Ferrari forum all the time, but I notice with those cars a few grand here and there is just expected. Also the high entry fee kind of keeps the people who really shouldn't be driving them out. A $5k service on a $100k car isn't a big deal. But you get a second hand MB for $5k-$10k and a $2k repiar is a big chunk of the purchase price.