I’d originally thought that one of the biggest winter missions in XoR would be an IAP, but the wholesale revolt against it changed my mind.
This was also back when we were sorting out the business model, the games cost $3 with little variation based on length, and CoG had only just discovered that using an IAP to buy the rest of the game in Android significantly boosted sales (albeit at the cost of a 0.1-0.2 point drop in aggregate review score due to extra 1 star reviews).
The discovery that the market would bear higher prices for longer games changed the picture. Back in 2013, I think our assumption was that if the price went above $4 or so, piracy would eat up the margin. That proved untrue.