Admit it, how many people do you know bought a Wii and only played Wii Fit or Wii Resort?
However, swap out Wii Resort with Wii Sports and add Mario Kart, Smash Brothers, Boom Blox, Mario Galaxy, Wario Ware, Mario Strikers, Guitar Hero and New Super Mario Brothers and you're correct.
In fairness the only person I know that played all of those is me, but everyone I know played at least 3. And, typically, no more than that 3. Worth noting that only 2 of them are third party, and only 2 don't have Mario...