Funny when you think that if you count the PSU costs @ 75$ you never ROI a .72 BTC S3 miner. (at 15% increase diff and 350w @ 0.1$ Kw/h)
Only winner here is Bitmain.
I already made back 62% of what I paid for my Rockminer boxes in less than 2 weeks and will have no problem doing the same with my R3's. If you have to ask how, you obviously haven't been around long enough...