Well that's a problem, then. The cover is so off-putting and the basic premise was so horrid nobody bought it to know.
I remember when this game was announced (along with Dogz 2009 or something) that they had "zeroed in" on the Wii demographic and made both of those titles with "them" in mind. Both flopped hard, selling less than No More Heroes, a game UBISoft just published. With this set of data, it seems like Wii owners don't want baby games or Pet-raising game. (Even Nintendo knows this, they've only ever released Nintendogs, way back in 2005, with no sequelicious cram-down to follow). But Wii owners get told that they don't buy anything, or that they are Nintendo fans, or whatever. So no wonder Wii owners mostly buy only Nintendo games.
"You've made your bed, now lie in it." This is the problem third parties face on the Wii. Nintendo has learned not to try and cntrol third parties, and thus third parties are free to make whatever their want on the Wii. What third parties have chosen to make was a bunch of really bad shovelware games, made with the idea that the consumers are idiots who can't tell the difference between "Vacation Sports" and "Wii Sports Resort." The consequence is that Wii owners are suspicious and not trusting of 3rd party games. This would be pretty damning to Nintendo if Nintendo weren't #1 with a bullet, and third parties' current strategy is to let Nintendo have this:

All to themselves. They want Nintendo making half of all the money while every body else splits the other half. that's just bad long term strategy and will only strengthen Nintendo in the long run.
A good company will own up mistakes, admit failures, and strive to always make better products. Nintendo has mostly done this. A bad company throws blame around to everybody else except themselves, and will close up shop just because their preconceptions of easy money are wrong. Third parties have mostly done this. Who wouldn't prefer Nintendo?