I'm telling you it's very possible to make good money in iOS app development if you do the work, real work, and create an interesting and useful app.
You make the interesting assumption that interesting and useful apps involving real work always make more money than those that aren't and don't.
I do a fair amount of competitive analysis in my particular product niche. I buy and test a lot of my competitor's apps. I can tell you from this analysis that useful and difficult to develop apps are often in the bottom half of the store, and free or quickie cruft can be in or near the top of the category (including a few apps that don't even work correctly!). Marketing and luck play a very large part in making good money from apps.