According to an article by Wax Insurance, ticket stubs are the real hidden gems of the sports industry. The digitization of the ticketing process in modern times makes the physical relics all the more special.
They say "the memories linked to ticket stubs make them all the more special. The fact that stubs aren’t printed en masse for speculating collectors, which means supply is organic and more limited".
You can read the full article here: https://waxinsurance.medium.com/move-over-trading-cards-ticket-stubs-are-the-ultimate-collectors-items-for-sports-fans-5e6fa1a25e4b