Why not more?

Wii Sports was available with Wii, Wii Sports Club was not .... Yet we find the same sports, this time more beautiful, more fluid and more accurate (Wii U requires) which would in fact a nice technical demo. But why, nor sports while the game comes out independently? Table tennis, archery, darts, swords, etc ...?
Mystery.
However, to rediscover the joy of games two, three or four, what happiness!