A few months back you were asking for a loan without proper collateral, now these days you are trying to sell off over a dozen of the highest priced GPU; you are quite the financially volatile individual. You say that you have 15 units, then you say that you have 8 units + PSU. What sort of PSU are you referring to for a 1080ti? Is it 15 or 8 units? Are you able to provide a picture of the 15-cards, because the only picture you posted shows a couple of other cards, but certainly not 15-1080tis.
$680 is more than you're going to get for these, in my opinion, you'd be better off somewhere closer to $550.
And what we have enough to ask credit and to be engaged in trade?
Or you have to judge my financial stability?
There are cards which need to be sold
There is an equipment which I sell not the first day
Write to contacts and I will show you 15 cards and many other things.
Only it to satisfy your curiosity