If whom you think to be a reliable business source (pay money and get appropriate return) turns out not to be, in my opinion, it's appropriate to view them in a more critical way! That's all that I'm doing! Bitmain clearly isn't an operation to trust with your BTC value, they are perfectly willing to revise value without notice or refunded BTC! How much your purchase BTC is worth against their miners is clearly unstable (even day to day)! Count your blessings! Perhaps this is the problem presented by lack of immediate competition? I paid $419 per S5 3/11, please adjust that to the current $369 3/12. Thanks very much! Am I truly wrong? Let's put it this way, I'll buy again when it comes to the S7, my unmet intent for coupons! Treat me as a valued customer, not an enemy! Guess what, I'll respond accordingly!
Miners are pretty much priced with a 3 month ROI, excluding electricity and shipping. BTC price goes down, miners price goes down. BTC price rises then they raise the price of the miners. Been this way for quite a while now.