One, they are going to sasturate the market which will drive the prices down significantly. They cannot not saturate the market, because GPUs age due to new developments by manufacturers. This already makes the prospect of recouping initial investments rahter dim.
Consider that non-miner market has a huge distain for miners and are willing to pay premium on new cards just to stick to the miners. I don't think resale value is going to be spectacular.
No, the most ROI efficient cards are 4-5 year old cards (like the RX480). ETH's algo, ethash, is memory hard, which means that it is a false narrative that buying the latest card is necessary. The bottle neck isn't the speed of the card, but the speed of the memory controller.
I suppose they made some money by running these cards..
They stand to get SOME of the initial investment back, unlike BTC ASICs, they are basically worthless outside of BTC mining..
Consider that non-miner market has a huge distain for miners and are willing to pay premium on new cards just to stick to the miners. I don't think resale value is going to be spectacular.