HBO was a perfect example of this. Cable companies acted as the middlemen, because HBO didn't have the staff or inhouse expertise to operate a direct-to-consumer facing product. Now they do, but cable companies can still offer services that make their participation as middlemen sustainable and desirable for some consumers.
> That is liquidity where it might not have existed previously.
It did exist, only it was stolen by scalpers. They're not creating value out of thin air. They're not redistributing assets geographically to make them more accessible, or offering secondary insurance or warranties that make choosing them a smart option. They're stealing opportunities from actual customers looking to purchase a service or good, but instead are forced to secondary markets because of rent-seeking parasites.
Without scalpers, the product is distributed by sheer luck like a lottery, or being well-connected and knowing somebody who has early access to the product.
You can argue that a lottery mechanism or being well-connected is more fair that having the necessary money. There are a lot of people in planned economies where everything from food to housing to transportation works that way, and they would probably disagree.
I didn't say they did. But by the argument of the GP, they are often (depending on the product) "needless middlemen in a market that already sells direct to consumers", which is what I was responding to.
> They steal liquidity
They offer stuff for sale in markets which would have nothing for sale at other times (because if supply didn't outstrip demand, there would be no profit to be made). That is liquidity where it might not have existed previously.
I understand not liking scalping. I don't necessarily like it (I would prefer there was enough supply to satisfy demand). But there's a difference between not liking something and not understanding it and denying the reality of it. You can't stop it without understanding what makes people buy things to resell at a profit, why others are willing to pay that extra amount, and why there aren't enough of that thing to go around in the first place which allows it to happen.