I wrote a puzzle app for iOS - https://itunes.apple.com/app/id906543727 It's free to download and try it out, but then I charge for additional puzzles. I was keen to give a complete version of the app for free (without ads) so that people understand clearly what I'm offering. This strategy seems to be working with good and returning custom. Not $1k yet but some reason for optimism ;)
What's the current situation with In-App Purchases and patent issues? I'd like to do fund a smaller project of my own but I'm put off by the problems other developers have had in the past.
http://www.androidpolice.com/2015/01/03/ding-dong-patent-tro...
Anyway "The last Lodsys patent technically expired in 2012 - the LLC had been suing based on past infringement"