It's not so different for the majority of iOS AppStore games, actually, unless they get favourably reviewed or go viral, which means they are either extremely original (or really dumb, but that is occasionally the same thing <img src="smileys/smiley17.gif" border="0" align="middle">) or outstandingly polished. Following some blogs and posts by hobbyist iOS devs (not companies like Playtrix, Gameloft, etc.), it seems many get an average of 1-2 sales a day, at .99, and sometimes not even that, even if they achieve hundreds or more downloads a day.
But I think it's nevertheless worthwhile sticking with it, even if you have so far only made a dollar. You gain experience and skill, and even if you may not end up making a living with your own games, you may at some point get to do contract work. HTML5 is going to be huge, after all. (Might want look a little into Javascript or the SDK, too, or the BrowserQuest source.)