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Here is the second good example of selling premium content:
Robokill - besides it's high unique quality, developers earn money ONLY selling premium content.
Follow up:
Monetization works easy - user just send money via paypal, and his email become the key to unlock some hidden features.
Game was created by 2 people, like all of rocksolidarcade`s games.
First example here was by Drunken Masters.
I wish the best luck to RSA,
Well done, guys.