I think the Android market is large enough that it could support a healthy second app market. The 30% pricing that Google is currently able to charge indicates

I think the Android market is large enough that it could support a healthy second app market. The 30% pricing that Google is currently able to charge indicates the complexity of creating a new market - a successful market requires that consumers, app makers and phone manufacturers all act together. This can be difficult since in the short term it's easiest for every market participant to just use the Play store. Creating a new market takes upfront $ and is a risky business.