Is it ever worth buying overpriced ones from eBay? The price direct from Bitmain is already overpriced; adding more on top of that is shooting yourself in the foot.
Sometimes, but certainly not now.
Some ebayers get very good coupons I just got one for 8% it expired yesterday.
this is 2200 - 8% coupon = 2024 and I can get 1% off via ebates so -22 = 2002 and I can get 6 months to pay it at 0 %
so 2002 net cost and 6 months to pay with ebay protection and this was close to worth it yesterday.
Coupon is gone so it is not worth it. But yesterday it was close to worth it for me.
http://www.ebay.com/itm/AntMiner-S9-B2-12-93TH-s-Running-11-1-11-6-Underclocked-Stable-/172280227864?