Wrong. Historic paintings are less available than even the rarest of video games. Even the rarest ROMs i.e. Nintendo World Championsuip, number in the hundreds. If it were really at the point where no one ever bothered to dump the ROM, there would be 1 person out of the hundreds of NWC owners who would be willing to dump it for Nintendo, and the cart owner could get paid by Nintendo to do so.
What I have an issue with is that none of the ROM hosters are paying royalties to the people whose products they are profiting from. Video game brick and mortar stores suffer in part because of the piracy. It also legitimizes the "repro" (counterfeit) carts which I have an even bigger problem with.