Don’t get me wrong, this is among the least offensive iterations of the phenomen, but middlemen can be pretty shitty in any transaction.
Sometimes they provide a useful service, acting as a sort of external sales and marketing department for producers who for whatever reason don’t have the mechanisms in place to get their products out to their would-be consumers.
But who likes a scalper? Who believes that a guy with an automated purchasing script is adding value to Taylor Swift tickets? Or that the people buying multiple PS5s during the early days just to resell them were providing a useful intermediary service? No one.
And likewise taking something you don’t want off of Craigslist before someone who actually wants it can get it, only to flip it on another site, doesn’t add value or provide a useful service.