As a person who is working on a game project on the side (that I have been neglecting recently due to time pressures), I find this double revenue model very interesting. So the game is free to play, but with ads upon death, of which he gets less than a penny.

"Those ads drop less than a penny in Mr. Howse’s pocket each time a player sees one. But with an average of 460 million fails a day"

So he is making mad revenue just off the ads, and then the percentage of players who pay add up too... all while providing an entertaining game that people like.

While I have always hated ads in game, I have a feeling this is going to be the main model for the next few years given the dominance of advertising. It saddens me that novel content creators don't get as rewarded for pure exchange of product (here is game, here is money), but I can't really say I blame them for starting to adopt this model, and to be frank it is making me reconsider my traditional approach of pay once.