wow, interesting, this is exactly what I hit in 100d on S1 (on average). they must have some formula to predict this.
14% in 100 days is 60% a year. Don't tell me you hit this on the stock market on anything else.
I would say BitMain is well aware of our margins, I am tracking everything in a spreadsheet (IRS) for S1, S2, S3.. they all seem to be on that mark, S1's early appearance really gave it the edge. My first S1 I paid 1.9BTC ($1554.96) ran it for 180 days and then sold it on ebay, net was $634.61 / $1554.96 = 41% Net profit. My first S2 is @ day 129 and is currently $1012.95 in the black, other 2- S2's are 64 days in and @ 49% ROI. SP10's are 63 days in and @ 37% ROI ;(
Just like the market you have to hedge your bets, keep your eye on the future offerings, and get IT while you can! Basically I have watched this grow from a $1500 hobby into a 30K small business. Bitmain is helping me keep that going by NOT raping every nickel of value out of their offerings.