Why they are selling used, dirty hardware to loyal customer's isn't correct. I wanted to establish a long term business relationship with them but when I mentioned about receiving used hardware I just got odd excuses and weird responses just as you did. I usually contact and speak with Yoshi since he's been wonderful since the day I started buying Bitmain products but the last few engagements about receiving used hardware was pretty much just left on the table by them. I would have worked together to resolve that issue but lack of responses and no willingness to correct the issues just weren't present. I still would love to keep a business relationship with Bitmain but when you think about the past experiences it almost forces you to look at other hardware manufacture's. There will become a time when these hardware manufacture's need to sell hardware again and make money but we will also be in power with our pockets at that time to buy other hardware. I also remember the price hike when the S5's were available and since Bitmain knew they were the only ones selling at that time sort of took advantage of that in more of a greedy sense then smart business. I've owned a couple other brands of mining hardware and none of them were used. They all had fresh new car smell. Using an excuse about dust or testing them is just being rude to us and disrespectful. It is unfortunate so many miners couldn't stand up to this type of business practice, because all they wanted to do was get them mining and didn't care if they were new or not. There is really not much more to say....a lot of us are in the same boat.
p.s. My dad received used old hardware also from Bitmain. Old revision 1.3 boards. Completely different design then 1.7, 1.9 revisions. This miner with stock fan would reach abnormally high temps on one board, the old board of course. We brought attention to Bitmain about how dirty, dusty and used it was but really didn't get anywhere with having it replaced. There was no willingness on Bitmain's part to replace it. Anyway, the miner was taken apart, cleaned and new thermal compound applied. Put back together and now it is the coolest running rig in the whole bunch. Temps dropped considerably and stay at a constant 46-48. This type of thermal was used.
http://www.arcticsilver.com/cmq2.html. So, if you have a few boards that just can't keep the temps down you may need to clean and re-paste your thermal compound.
Will I buy Bitmain products again? Right now, no. I'll just stick with buying coin, since no hardware right now could make back what it cost.
). In next release i plan to add crontab as many people asking me to do so.