> Adding 500,000 cubelets costs $10.99, which implies that people have paid ~$103 to add cubelets over the course of 166 days, or around 62 cents per day. Gross revenue from all cubelet sales in either direction is ~$308 or ~$1.85/day.
Your numbers are way off, as is the timescale. The ability to add or remove cubelets is a new feature, released on April 17th. At ~$405.75 to change the cubelet levels using the most economical price ($10.99 for 500k, or $21.98 for 1 million, over 18.46 million cubelets[1]), that's ~$101.44/day.
[1]: "...users have paid to remove 13,780,000 cublets and add another 4,680,000" from http://www.eurogamer.net/articles/2013-04-19-molyneux-adds-o...