>>46099310Because the Mystery Dungeon games are roguelites which are already very niche. Pokémon spin-offs don't sell well in general. Colosseum, XD, and PBR sold roughly 1 million each. Stadium sold 5.2 million, snap sold 3.6 million, and Stadium 2 sold 2.5 million. The first Ranger game sold 2.7 million.
As a whole PMD has sold like 16.5 million titles.
