User blog comment:J. Severe/Phineas and Ferb: Quest for Cool Stuff/@comment-26124383-20130426022311/@comment-1518158-20130428233633

Publishers don't care about making the Wii U sell well, they're focused on getting more dough for themselves. They're going to go for what makes them the most money -- Wii has nearly 100 million owners, Wii U has about 3 million, so it's only logical that they put their games on Wii instead (if anything, we're lucky that in this case Majesco decided to put the game out on Wii U too). And Nintendo's not going to stop them from putting their games on the Wii because that would just entice them to go Sony/Microsoft/Valve instead since they won't let them put their game on the platform they want to.