Never noticied the AppStore was some kind of heaven where money rained.
Seriously, so much entitlement. If you want to make money selling games, you have to spend a lot in advertising, how much does Clash of Clans and etc spend? It's the rules, it always has been, what's the surprise? Maybe it worked for a couple of months out of novelity, but it doesn't work any more.
Get real, people.
And yes, it's free games with IAP the rules. Because they are designed for kids without credit cards that at most buy iTunes gift cards. And yes, it's jewel and candy games, because that's what there is for girls, which are 50% of the population that the "mainstream gaming" has abandoned.