> If you have a large NES collection, there will be someone interested in paying for it. If you have a large Switch collection, there will be someone interested in paying for it.

Well, yes for the NES. There's a limited number of cartridges made, there is no digital substitute, and the official cartridges are not being manufactured anymore. The demand for NES games is a product of their scarcity.

But have you tried actually selling a physical copy of a modern game? It's not like you're making your money back, you're lucky to recoup 1/3rd of the MSRP if there's even anyone interested in waiting for your copy to arrive in the mail. But there's also complicating factors like piracy, the immediacy of digital storefronts, and the used market controlling (and lowering) the price of used games. Famously, a trip to GameStop with a stack of PS3 games is worth maybe $5 of in-store credit and a complimentary soda pop.