Looking at the sales number given, I would love to hear your reasoning on why not.
I play the game everyday, so that's going to color my view on it. But to me, it's much higher quality and fuller in content than the $20 Brain Age 1/2 games, so expecting it to only sell for $10, just because of the existence of iOS games is like saying all 2-D games should all be $20 or less downloadable titles. It completely ignores what's gone into the game to make it what it is. I'm gaining, what is to me, significant worth from playing it everyday, as well, so that adds to its worth, in my view, too.
Does the market agree? Obviously, not. But just saying "It should've only been $10" coming from someone, who I seriously doubt has played the game (if for no other reason than by looking at the sales
) does not sit well with me on a personal level.
That's my reasoning, at least.