I cut the sidewall off of an old tire and put my gear stack in it. All that stuff gets thrown in a box for travelling, so it protects against anything random from banging the teeth up.
I don’t think tracks have enough tyres to do that, unless they buy dead tyres from other drivers. Not that I would be opposed to that idea, it would be better than throwing away the tyres.
It would definitely take a few seasons. Local track out my way perpetually has a 40ft container full of tires between their rentals and competition karts.
It’s basically an exchange and I think when it gets as it gets full the tires get put out as barriers. Even at 2 or 3 tall they can be a nice cushion in front of car tires.