Let’s face it–Apple’s App Store is big business. Really big. And if you paid any attention to the fact that Apple saw its 1.5 billionth (yes, with a “B”) app downloaded back in July, you’d know that things still weren’t even close to slowing down. But have you ever stopped to think about just how much cash is being generated in the store frequented so often by iPhone and iPod touch users? AdMob’s latest findings, which study usage habits of smartphone users, saw that around $200 million of apps are sold each