Mario Kart Wii sold more than Super Mario Galaxy because the word "Wii" leads to the highest sales, I thought that would be obvious after reading the top sellers list and the explanation below. Read more carefully.

As for Super Paper Mario: it's quite obvious that the word "Paper" is dragging down the sales of the game, evidenced by sales history. Everytime a "Mario" game had also "Paper" in its title, the positive effect of "Mario" got limited significantly. Out of the three Paper Mario games, Super Paper Mario sold the most units, obviously because it's the only one with "Super" in its title which as I outlined in the OP leads to more sales than "Mario" alone. 

What the hell is up with some of you people? Can't you understand the simplest things?

Look, adding "Party" to the title decreases the sales potential of the "Mario" name. It has always been that way. Just compare any Mario Party games to the Super Mario games on the same console, they always sold less.

1) Nope, there's no indication that "Party" is helping the sales of "Mario" games, but there's plenty of evidence that the addition of the word "Party" leads to lower sales of Mario games, just like "Paper" does (even "Super" didn't help Super Paper Mario to gain a lot of sales). So why would any sane person suggest to add a word to a title that has proven again and again to decrease sales? You are posting absurd stuff.

2) Incorrect. People don't tend to buy games with ultralong names. They are confusing and people don't know what they are getting into, so they stay away. You would be a horrible salesman.