[homulilly]

> he thinks he can no longer write apps for Android, whereas it is obvious to me that you can put a .apk file up for download anywhere you want, and get paid by means other than Google Wallet.

He justifies this pretty well. Very few people are going to buy your app if it's an APK on a random website or even on another app store. The next biggest marketplace I can think of is Amazon's and it's still puny compared to Google Play. Without access to the main store it's not financially viable to develop for Android.