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If all tickets are the same price, then any buyer-seller combination will do. I believe the seller doesn’t get to choose the buyer and both are anonymous. No way to coordinate such an out-of-band payment.

They're not all the same price. They have the same list price, but once the show (or the desirable floor section of the show) sells out, the real price floats.

They don't even have to have the same price if the seller just effectively returns the ticket back to the system.

Then it's up for grabs.

There's no guarantee for the buyer that an out-of-band payment will get them the ticket (someone else can get it), and there's nothing that forces them to send an extra payment once they do get the ticket.

They can demand all they want, but they can't guarantee any way of getting the ticket to the person that send a payment... which makes it a bit of a tall demand.

Because the platform doesn't need to expose the details of buyer/seller.

Most tickets these days are digital.