So are you telling me that all this hashrate is mainly from the chinese manufacturers? I find it REALLY HARD TO BELIEVE IT considering that the S7 is on the market for over 5 months now and the exchange rate is bigger than 250$ for over 3 months now. Why would anyone buy miners who were present on the market for such a long time now instead of 3 months ago? The network has added 200PH/s in just one month. You would have to be ultra retard to invest such a big amount of money for an old generation of miners when your chips were knocking on the door. You and 21Inc are the only ones that are capable of deploying such massive farms. I simply don't buy what you said, but it's understandable from your position 
Why does someone have to buy rigs from Bitmain and/or Avalon to increase the network hash rate? Can Bitmain and/or Avalon not add this hash rate themselves without selling to someone else? Can Bitmain and/or Avalon not make one last push before the block halving? Hell, those of us who bought their rigs paid 3, 4 or maybe 5 times as much as their cost to make them. Which means they could make 3 for themselves [at a minimum] for every one (1) they sell to us. They could set up their own "Unknown" pool to mine solo from without adding it to their "public" pool.
42.000 antminer S7 in a month? i sounds a lot of miners...