Also, I do have to outsource a good portion of the server-side stuff as I am completely unfamiliar with that side of the app. So a chunk of the income each month goes to maintaining all of that (hotel info, weather, subscription validation, etc).
And don't forget about Google's cut. After they take 30%, I still have to make up the difference and pay for the server-side stuff.
And after self-employment tax in the neighborhood of 30-35%, this thing isn't nearly the cash cow for me as everybody thinks.