Hmm. Honestly, it just feels to me like this is asking the question backwards. Whenever you state that you can create mobile device X to serve purpose Y using an OS based on AOSP, I get the feeling that I could already point to an existing mobile device X serving purpose Y that runs Google Play-based Android. Or, at the very least, I could produce such a device. And in doing so, I'd avoid all the costs of creating a new OS, and still be able to sell to users who already have experience (and infrastructure!) running standard Android devices.