You're right, the coupons have expired. You're missing the point though. A month ago these things were going for $450/unit from the manufacturer... The price has fallen out of the bottom with the halving in 45 days. (I was picking up S7 with PSU bundles for $400 a month ago).
Just do a bit of quick math. Assume modest 5% network growth per interval. Take dirt cheap electric rates of $0.035/KwH. You get a total net revenue of $320 from this unit before it runs in the red. And that's after 300 days. Between day 180 and 300 it makes a whopping $20.
So in 6 months you'll be in the hole $100/unit with the possibility of shorting that to $80/unit if you can wait another 4 months...
That's assuming you have free and available PSUs ready to go...
I can't tell if you are trying to negotiate a price or just complaining.
If you are negotiating, please send me a PM..
If your complaining, the price is in line with what others are selling S7's for.. Feel free to post links to
credible lower offers.