Conventional wisdom has held for a while that Apple's iOS(s AAPL) platform was by far the best way to monetize apps. Sure, Android's(s GOOG) platform was big but the users who tended to pay for apps were most likely using an iPhone, iPod touch or iPad. That's changing thanks to the greater diversity of app monetization strategies -- in-app purchases, driving traffic through social channels, and advertising -- a panel of app experts said during a session at…