IMHO Nikon D700/300 did not fall that quickly. Note price hold on M9.
Well, those Nikon cameras were all in demand and had supply issues at times. The M9 is a Leica...Leicas always do better resale wise. You are starting to see some M9s sell for 75% these days. Once the Fuji supply caught up with demand, it is bound to be selling at normal used prices.