Not so sure about that.. I have read a few stories, within the last couple of months, that all of the good NVidia cards are being sold (to the miners) faster than the public can get their hands on one (for gaming).
This is the reason I went ahead and purchased an RTX (instead of GTX) 2060 at the beginning of this year.
It’s a shame, this 3xxx is basically a skipped gaming generation. By the time the 4xxx’s are out, they 3k’s will be worthless for gaming.
However, ethereum is going to switch to proof-of-stake so all those graphics cards will no longer be useful. There are clones of ethereum that require high memory BW (and clones of bitcoin that require bitcoin HW). But those clones are not nearly as popular and won't create as high a demand.
If you can take a profit on your graphics card, I would do it before the switch-over to PoS.