Our 1995 C36 had about 100,000 miles on it, and it had a compression check at about that mileage that was new spec. AMG bits seemed pretty bulletproof (unlike M-spec BMW parts...) and built for the loooong haul.
I'll agree about AMG brake maintenance items being pricey. The rear brakes cost more than front and rear for the C230.
AMG seems to boost power through displacement, and now supercharging as opposed to stratopheric redlines and engines set on "kill." They beef up engine parts and transmissions, and use "higher" off the shelf bits where possible.
It's a different philsophy from "M."
1998 C230 "Black Betty"