The sales threshold is probably to deter developers from pumping out half-assed shovelware that a few people will buy and hate because it's half-assed shovelware. No one would want to half-ass their shovelware if there was a sales threshold that said they wouldn't get paid unless it sold x amount of copies.
While I agree on the statement regarding shovelware in general, the Wii was the manifestation of shovelware. It didn't stop companies from making shit and Nintendo giving the games a thumbs up..
Got this on my Vita also Day 1 but i never bought a single WW game in all my years having my Wii kinda weird.......
Now if only i had the monies to get it hopefully i can before the Deadline.........