Google also devotes energy to search, email, robot cars, internet balloons... the idea that having a closed source set of APIs for google products is stealing resources away from android is specious.
The point is that more energy being put on closed source Android development rather. Yes, Google has a lot of money but money is not it's only resource. Unnecessary projects have been closed off like Google Labs, Reader etc etc.
Google has a limited range of focus, Google's Android developers have a limited range of focus and Google would seek to guard them against unsupported distribution systems (open source ones). Maybe Google will open source more?