Comment by RL_Quine

Ethereum is mostly mined using custom hardware, it's not graphics cards really, certainly nothing you could re-sell to anybody who expects to play Bioshock or whatever. Very small operations are people buying and using actual consumer GPUs, but they tend to be absolutely destroyed by the process and then sold to unwitting buyers. I've sorted through literal milk crates of GPUs before to find a single one which could reliably display a video output after they had been used in a mining operation.