In February 2009, Arron La's $0.99 Advanced Task Manager was one of the first paid apps on Android, allowing T-Mobile G1 users to do what was then a novel thing -- close applications. (We immediately bought a copy.) Today, the app is all but obsolete, its functionality baked right into Android's core, but Arron's still making thousands of dollars a month. Why do we bring this up? Because nine months after Arron released the pay-first version, he unleashed an ad-supported variant as well and since that day, each has contributed about the same amount ($30,000) of money. It's not exactly an object lesson in what's p
