Yes, I had a 2070, I also upgraded to 4k, which the 2070 struggled with some, so I did need a upgrade. The 2070 also had issues in the way of a failed fan, and something was telling me not to try to replace it (turns out I had the wrong size thermal pads for it, so there would have been issues). I was able to sell the 2070 for a profit, while also making it the lowest priced 2070 I had seen listed. Yes, I had disclosed the issues with the fan and included a replacement heatsink for the card. That offset the price of the 6700XT, which I bought at it's currently listed MSRP. All said and done, I paid $425 and my 2070 which I paid $325 shipped for and used for right at 1 year. While yes, I wish it would have been less expensive, I honestly don't feel $750 is a completely unjustified price for a 6700XT, especially with today's market. I would not have bought the 6700XT without the ability to sell the 2070 for a profit.
BTW, yes, the person I sold the 2070 to was able to figure out the thermal pads being wrong and got the card working with both fans working.