You don’t cash them in after every session, do you?
I do. You never know when a casino will change chips, or even close.
My wife was fooling around at a slot machine once and would up with a ticket for $5. The line was long at the cash-out machine so I said we'll do it next time. Next time the Sands AC had closed.
Yes, we could have cashed in somewhere, after the fact, but it wasn't worth the hassle for a few bucks.