What you mean is, why is there so many games for normal people and not just hardcore gamers.....like most xbox and ps's are aimed at.
I love some of the crap throwaway games on the wii, my kid does too.
Sometimes people just love to play stuff without too much energy and thought put into it, and they are usually cheaper to buy and make. How many ad's have you seen where people say they have not used their (place console here) for months and just want it out of their way....it is usually because they cannot afford the 50 or 60 dollars a time for the high end games so the console sits idle instead.
That is my opinion anyway.