I think all emulators in the world should be free software by design. But I don't came here to judge Exophase or Lordus, but to make a proposal: what do you think of contacting Humble Bundle guys and propose a "Humble DraStic Bundle" (as a full bundle or weekly sale) to help spread DraStic in the Android world and - as a bonus - open the source code?
Several "Humble Bundles" are well remembered for having raised millions and allowed indie developers to open their sources. All of these games became free software: Gish, Penumbra, Lugaru, Aquaria, Revenge of the Titans, Jack Claw, Darwinia, Multiwinia, DEFCON, Uplink, Shadowgrounds and Shadowgrounds Survivor. Source: http://en.wikipedia.org/wiki/Humble_Bundle.
DraStic would be distributed by the Humble Bundle Android app (http://humblebundle.com/app) for the hundreds of thousands people who collaborated and you could still maintain the paid app in Google Play (at the same or for a symbolic price, like one dollar).
DraStic's source code could go to Github with a GPL license and it could be enhanced by the community and even included in projects like RetroArch!

The money could be used for you dedicate themselves exclusively to DraStic and port it to other platforms like iOS!
Please don't get me wrong, I love Exophase for his amazing work with gpSP and I just would love if Drastic was the same way!
This could also be a crowdfunding project (on Kickstarter or Indiegogo), but I believe a Humble Bundle would have much more success!