I think that is exactly what the big players do.  They probably buy bulk and get a discount and then use that price advantage to downclock underclock and save even more w/gh.  Then due to either business miners having to sell BTC to pay for costs in fiat, and the relative cost of mining a BTC comes down as the total cost per btc lowers with more efficient miners.  This is offset somewhat with the increased network difficulty, so I would think that the price should gradually begin to rise.