It's not even so much about the money. I just find it pathetic that there is a market for a utility which produces fart sounds. Hell, it could be free and I'd still find it sad.
I mean, okay, maybe farting was funny when I was five. But if you're old enough to own an iPhone, you should be old enough to have a slightly more refined sense of humor.
Granted, "refined" is extremely subjective and arbitrary, but you asked so there you go ;)
How mighty of you. You can buy silly mechanical fart machines, cds of farts, whoopee cushions, etc - all of which are many times more expensive (and less fancy) than iFart. So all those people that are looking for a tech bargain and think loud stinking gas emitted from a human anus is hilarious are in luck.
Outside of your self-righteous indignation, of course.