guys, in your calculation i'm not seeing any reference of a customs fee, that in this case is a pain in the ass for a decent ROI. At least let's check that bitmain is declaring low values (like the amazing 120 USD computer gaming gateway

)
no customs to the usa for this item.
Well at least you have a better chance of a decent ROI than a lot us us then.

Even at 0.9 BTC I wouldn't be jumping at it, due to the extra charges just to get it into the UK.