Not sure why you think that it is a scam.
Unlikely, in my opinion due to his high ratings (unless the account is hacked)
bitmain sells for 1508+54=1562; add at least $150 due to shipping delay=1712, multiply by 1.13 (ebay+paypal fees)=1934, not that far from 1999, which includes shipping, incidentally.
A little overpriced, but not grossly so...there are other machines for $2300, so i just don't see it.
I guess my main concern was that he is only accepting BTC, Bank Deposit or cash. All of those are against EBay's payment rules and terms of service.
And would make most people think twice.
None of those give you any recourse once the funds are delivered.
Buying from Bitmain or Avalon with those payment terms is different. Those are the payment option you expect.
Yes, you never can tell if someone is using another vendors name and reputation. I have seen that a number of times on Ebay in the not-so-distant past.
Anyway, if Ebay doesn't like it or it is a fraudulent listing, it will be removed.
If the listing is valid and it's just the payment options that are invalid, it can be relisted with payment methods that give the buyer some protections.
Just my $.02.
EDIT: Both listings now show: This listing was ended by the seller because the item is no longer available.
if you sell through ebay, this fact is all that matters, see below.
you can always return an item if it is not as described, hence many people return items that they themselves messed up, making the whole experience less than optimal for both parties.
he can actually request bank deposit, which is perfectly reversible for a while.
btc maybe not according to their current rules, but it really does not matter as $$ value is always reversible for some time.
ebay/paypal will just take $$ out of his account, if needed (return), providing that it was not a fraudulent posting from a hacked account.