Amazon has been testing in-app purchases for a bit, but Kim-Mai Cutler picked up on the most interesting aspect of this — developers getting full price control:
So why do in-app purchases get a special exception?
Because in-game economies are very painstakingly designed and calibrated to make sure there is an even balance between currency sources and sinks. Developers have to make sure a user’s progression through a game seems natural and addictive at the same time.
Amazon’s commandeering of Android for their own with the Kindle Fire has gone very well except for their bad choice to insist on the option to set app prices. I get it — Amazon has thrived by undercutting prices, why should this be different? — but all it has really done is piss off developers.
With the in-app aspect, it looks like Amazon is wising up.