A lot of the collectable hobbies that are popular now are geared toward the nerdy stuff, comics, Pokemon, Funko Pops and maybe not exactly nerdy, sports cards and others. There are a ton of YouTube channels critiquing them all and declaring them an investment with an ongoing future drawing in tons of people. All and others like them were/are created to be collected, and therefore are subject to overproduction and running the risk of becoming in one shape or form the next beanie babies.
I think a huge difference with collecting casino chips is it was never intended to be collected, they are a tool in a business. Casino used chips even with what very little exposure it gets in the mainstream will almost never meet demand. If this hobby ever really gets on the mainstream radar or worse, Paulson style manufactured chips are replaced with cheaper Cromwell or recent Palms casino chip crap prices will really skyrocket out of control.