The community consistently splits the range: the track-focused R and R Pro are expected to stay flat or rise on short supply while the GT, GT S, and GT C keep dropping. Commenters cite roughly 750 GT R Roadsters per model year with about 100 reaching the US, and Pro examples commanding well above standard R money.
GT R and R Pro hold value while base GT/GT S depreciate
Mercedes-Benz AMG GT (C190) · market