Eh, I agree that it will be a large demographic, just like the large demographic of customers who want a WordPress clone written in PHP and ranked #1 in Google for $500. I suppose they are "legitimate" in the sense of being legal persons, sure — but "legitimate" in the sense of "profitable" or "preferable to other options," not so much. If you want to work for an effective rate of $12 an hour, my experience is that a job behind the counter at Barnes & Noble will probably be less of a headache.
(I once had a client whom I'd given a ~50% discount. Upon completion of the contract, he declared that he'd only pay me half of my already halved invoice. If this sounds like fun to anybody out there, by all means, pursue $99 app customers.)