Basically I had my RX 470 4GB since 2016. In 2018 I started to sell them and honestly nobody was buying them. Gamers basically only wanted an nvidia. I would make an ad on Craigslist and It would take maybe a month or two to sell for $75. Most of the time I got nothing but messages like “I know you mined with this GPU I will give you $25 cash , today”.
Now with the last of my RX 470 they all sold for like $150 or so. And not only that but they sold in like a day or two and there were no low ballers.
So just realize this that once the dust settles and you want to sell your RX 470 it will be worth maybe $50 and will take forever to sell. So maybe right now is the time to liquidate them.
You see that is the thing, they dont sell now because they think this profit will keep going, they think this --> "this time will be different" ehhe, once they realize this was not different than 2011, 2014 or 2018. Yeah this is the best time to liquidate them at good prices, i mean 3 to 4 x the price you will sell after this crashes to hehell, from 50 usd to 200 usd easy, I think rx 580 4gb gpus are giving 1 dollar per day, so in theory trolls think --> "why sell for 200 usd while i can mine 5 months and get that 200 usd and keep the gpu" ehhe
They really think this will keep going like this for another 5 months, I'm not saying it will not, I'm saying chances are low.
The chances that ethereum mining will remain profitable is very low as you said but what if? Those who buy cards in November 2020 are already at the end of their ROI already, anything is possible but the don't right now is buying those cards at high price