It's hard to stand out within the Play app store, but the lack of competitors is actually an opportunity. And while I really hate using Java for web applications, Android is quite nice to develop for, once you get the rules and learn to navigate the boilerplate. I also find the wide selection of devices comforting when compared to the one size fits all idea (even if the one size is the one dictated by Saint Steven of Cupertino himself)
I have a doubt about the opportunities vs risks associated. For example, I am not seeing interactive books like the ones on the iOS platform. I understand that from the developer perspective there are a lot of work but this is because the entrepreneur carries the risk and not the final developer/non-founder
Seems like you need to ask "Google" about these things ;-) http://stackoverflow.com/questions/8892357/is-there-any-scri...
To be sincere I also prefer to develop in .NET with Visual Studio than in Java. And, if you ask me about the mobile market ($$$) size, I prefer iOS than Android. I see a lot of crap on the Android Market and a lack of high quality applications.