I told them that they were insane and I explained why. Their reply was that they sell gpu's at current market value. Perhaps their current market value isn't updated on a regular basis, but I essentially told them to fuck off, and let me know when they wanted to sell their stock.
Those resellers or retailers do not know anything about how much people are getting from when mining or using that card to, they base their prices on on how much somebody is willing to pay for a product they are selling, for example where I live RX 580 was $300 before this madness, they had thousands, in just one week, they sold 25% of them all, normally they sell only 10% at best per week, this is usually too much, so they increased to $450 then it continued, sold in the next week 40% more, at $450 and then they increased to $650 and then sold a lot more and now their price is $800 for a rx 580. There is no nvidia card at all, 100% sold. People are paying $800 for a rx 580 right now and if this continues, it will break $1200 for a rx 580. By the way I do not live in the USA, meaning cards are going to whoever pays the most and there are many people paying $800 for a rx 580 where I live.
I'm not a miner, I have a friend who is a miner and he stopped buying gpu's last march. He used to buy rx 470 for $140 and seeing these prices, he told he started selling his cards, best decision he will ever make.