Isn't this a little expensive for 8 used miners?
-$5k divided by 8 is $625 for a used miner and psu (the psu I am assuming is shared since its a 1200w). Shipping is not necessarily included, depending on where you live.
-bitmain is .893 BTC (currently BTC is at $487.01) = $434.81 and if you order a corsair 850 for ~$80-~$100 that brings the price to maybe $534 shipped for new ones.
Which means I could pick up 8 for no more then $4200 shipped for new ones.
Not to thread crap, but you are charging almost $100 more per miner for used equipment, which we have no idea how long they have been running, if they have been overclocked (which means they work harder), etc.
I think if you want to sell these, you need to lower your price according to used, not brand new (plus a premium).
Bitmain does not offer overnight shipping and your math does not factor in 7 days of missed profits waiting on that shipment. I'm also including all the necessary equipment to get started out of the box as well as prior configuration on request.
Thread crapping is precisely what you're doing.