By sales I meant popularity. That's my mistake considering they are very much different, though they're often intertwined.
Point being that while popularity is not end-all, as unique as someone like Muddy Mole or Chibi-Robo would be, you can't tell me either are anywhere near as realistic as Ridley or K. Rool whom, despite sharing an equal amount of gameplay potential, are much more likely on part of how many more are asking for them.
Okay well the clear up helps.
Regardless, I never dismissed popularity. I just dismiss the notion any character gets in merely on popularity. After all, the most wanted smash characters ever all were popular, but generally speaking all were very easy to understand in regards to how they would function in smash.
In Melee it was very obvious how the most popular character requests in Peach, Bowser, Zelda, Sheik, Ganondorf, Young Link, Falco, Marth, and Mewtwo could largely function, especially to fans of those character.
In Brawl it was very obvious how the most popular character requests in Wario, Diddy, Dedede, Sonic, Olimar, Lucas, Ike, Meta Knight, and Lucario could largely function.
In Smash 4, it's very obvious how confirmed characters in Little Mac, Mega Man, Robin, Palutena, Villager, Pac-Man, Miis (as avatars and with moves from everything), and soon to be Shulk and the Chorus Men could largely function.
Granted, there's liberties at every turn, but largely, they all make sense.
Similarly, the most popular potential newcomers left in Ridley, K. Rool, Rayman, Isaac, Dixie Kong, Cranky Kong, Krystal, The Masked Man, Impa, and Dark Pit would play like.