But there are other ways to monetize, right? Have you tried anything else?

I think it's also a testament to how easy it is to develop on. Admittedly I've only developed one trivial app for the emulator, but I jumped on the bandwagon way early, and it's only gotten easier. It's a tight little platform and anyone with an idea, an email address, and a couple hundred bucks to send to the Philippines will come out with a useable marketable app.