I put ads on http://jsonblob.com about a month ago and didn't really expect much, but have been pleasantly surprised! I should have put them on it when I launched it a little over a year ago...
In terms of breaking even, it's in the black if you don't consider the time I spent building it (and rebuilding it when Grails started falling over). It runs on a single Heroku dyno, so that's not casting me anything and uses the free tier of MongoHQ.
In terms of breaking even, it's in the black if you don't consider the time I spent building it (and rebuilding it when Grails started falling over). It runs on a single Heroku dyno, so that's not casting me anything and uses the free tier of MongoHQ.