How much money could i expect to make with android app?

I recently put together an app (http://www.ruckusdj.com) for rhythmbox to go along with a plugin i wrote for it to control the player via a web interface (http://code.google.com/p/rhythmote/).

The app is aimed mainly at windows users since linux users can get the plugin for free.

How much could I expect to earn if I did an android app and put it on the android app marketplace. The plugin is web-based so any browser enabled web device would work out-of-the-box. I am looking at an android app merely as a marketing avenue. Would this be worth the extra effort?