Just a random observation I have made is that many of Nintendos top selling series have consistant sales despite how well the console does.
3D Mario-It seems as if the big revolutionary 3D Mario titles like Mario 64 & Galaxy sell 10-12m and the direct sequels/spinoffs like Galaxy 2 & Sunshine sell roughly 7 million. That is on consoles with install bases of 21, 33 and 100 million.
Donkey Kong-SNES had 3 DKC games, selling 9.3m, 5.15m and 3.5m which averages out to just under 6m. DK64 did 5.3m and DKC Returns is at 6m. So Donkey Kong sells 5-6m on install bases of 33m, 49m, 100m.
Zelda-NES, N64, Wii had 2 flagship titles which the first to release sold 6.5m, 7.6m, 6.8m while the second to release sold 4.4m, 3.4m, 3.7m. SNES, GC had one flagship title which sold 4.6m each.
Metroid-The original on NES and the first Prime for GC both did about 2.75m and all the other entries sold 1.5m give or take 250k.
Kirby-The NES, N64 and Wii mainline Installments all sold between 1.6-1.8m
2D Mario-outside of the original on NES, the flagship 2D Mario titles sell between 18-27m. SMB3-18m, World-20m, NSMBWii-27m.
Mario Kart-this series does rely on install base as the N64/GC/Wii versions all sold about 1/3 install base of console. N64-11m, GC-7m, Wii-33m
Smash Bros-this series has grown with each installment so its hard to determine.
When the herd loses its way, the shepard must kill the bull that leads them astray.
























