Nintendo console users tend to not have quite the same interest in DLC as PS and XB users. we all know WiiU can have DLC, some of the best DLC is on that system (New Super Luigi U and MArio KArt 8 DLC), but DLC wasn't nearly as prolific on eShop as it was on PSN and XBL.
And as for Samus over there, HAH! I LAUGH AT YOUR IGNORANCE! "Oh, this game is cheap to make and shouldn't cost more than 10 bucks!"
Licensing, bro. Are you familiar with the term? Like 3/4 of that game's budget goes towards getting the rights to each and every song they put on disc. When you're getting popular music by some of the world's most popular and successful artists, that shit isn't cheap. Sure, we COULD all just play homemade songs like Guitar HEro's creator, and we can certainly get stuff that's all indie and therefore cheap, but who would buy that? NOBODY!
Just, damn. Seriously, Look up the Dunning-Kreuger Effect. The less you know about something, the more likely you are to believe in and perpetuate false information about it.
Licensing fees is something you already paid for regardless if it came on the Wii U or not.
This game has no original content, so I would never buy something this lazy. This isn't a rhytm game either, you can play this game just fine without the sound turned on. You're just hitting buttons they're telling you to hit on screen. How fun.