I think what's sad about it is the fact that while i have not played those games, the amount of time and effort put into them is not nearly as much as a game such as Valkyria chronicles. Not the fact that there are games a different audience plays.
Never played the game, but there is a REALLY high chance there quality is poor and the target audience gets fed with so much of the stuff they don't know otherwise. Take Hannah Montana for example slap her name on it and poor quality or not, it's probably going to sell if it's a product that can be seen viable. Hannah Montana cup? It may have lead up the yin-yang, but by god it's a cup with Hannah Montana on it and my child loves her. Same thing with the game. We can even say the same things with games targeted to men. we already know a vast majority of Movie/Game spin offs usually suck some ass with few exceptions.
Now while I have no interest in the games and refuse to play them to create a 800 - 1000 essay that we already know is going to be littered with my bias garbage being a waist of my time and yours. Now why don't we get someone who it's actually targeted towards and have them play some of those games, compared to other games their targeted to. Better yet a gamer who would actually enjoy hannah montana games. Chances are it's still crap.
I agree that it's sad to see them sell so much, but I have a different reason why it's sad to see it sell then the op.