I do have to admit, there is definitely a "cool factor" to using Perl on Android. As long as you are just experiementing, go ahead and have fun!
Still, if you plan to release your app to others, you have to think about the costs. This will add at least several megabytes to your project. You will also be using a build of Perl that is experimental.
When's the last time you used duct tape on a duct? --Larry Wall