It doesn't have to be like that. There are valid reasons you have to resell your ticket. There is a way to make it work without scalpers - ticket provider can provide resell platform and force that tickets are sold at purchase price.

This was the case in David Gilmour's concert in Rome a month ago. TicketOne.it has their own resalle site fansale.it. Good business for Ticketone as they also take a fee for resale, good for sellers because they have a safe way to sell if something comes up and they can't go. Good for buyers because they know these tickets are valid, and price is the original one.