NPD: Wii software sales are more concentrated on a few titles than 360/PS3

[Groucho]

You've already provided the support for this implication, noname2200, with your OP.

If you don't want to think about it, or allow it to mix with your own ideas of why this data is as it is, that's your choice. I'm not on a crusade to dig up more evidence, sorry.