I have been in gaming repair for 20+ years and i have one of the largest hoards of files in the community. It’s mostly bin files iso hdd images. All together its roughly 5tb of data. One of the companies i help out a lot has offered to buy a copy of my hoard. 99% of the files are online in different archives so im not too worried about legality i just have no clue what I would even charge for something like that. Buying everything one chip or cd at a time I probably have thousands invested into this hoard.
You can buy 5tb arcade rom drives loaded up on amazon, ebay, aliexpress and other places for under $200. I wouldn’t recommend selling or even sharing your files for free for legal reasons.