Jonathan Blow -creator of Braid and working on The Witness- also has a very nice critique on the problems with games that are designed around micro-payments. The whole talk is interesting, but he starts discussing the issues around the 20 minute mark:
I've had some friends complain that he takes too long to get to the point, but I would argue the comparison to TV is pretty important. I wouldn't skip it.
http://www.youtube.com/watch?v=AxFzf6yIfcc#t=1214