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

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.