I've worked in it for many years, and I've been a happy customer as well, spending a lot of my money on those games. I get a game, I figure out I like it, spend a few hundreds on it in a span of a few months, and move on after it bores me, with perfect return on investment. I've tried spending the same money in casinos, but they are just too boring — I usually can't even get myself to burn down the money I've decided to spend, so I take don't get the gambling comparison: mobile games a simply better as entertainment.