Simple, cause they aren't selling fast enough. They lower price little by little to get the suckers that want to pay more first before getting the rest of the buyers. That's why they were selling at first for like $7000.

How they work:
Get suckers that wants to pay $7000, then when there's no more suckers, lower to $6000, and when no more suckers, lower again, rinse and repeat until stock is gone.

In other words, to maximize their profits since they aren't as big as Bitmain to be pumping out toasters non-stop.

So for more me, I woudn't pay anywhere close to $2000.

Remember, they were originally selling for $1188 so they had to make profits. Once they realized third party sellers were selling for a lot more, their price jumped.