Charging for refills is very 1999. Hiding the dispensers behind the counter is an even more archaic practice.
Since it's a casino with little traffic during the weekdays you can expect most of the entrees to be in the steamed holding pans for hours on end which leaves you with old food that is in a constant state of degradation only for condensation to flow over and keep it in a constant state of limbo, much like quadriplegic on life support.
That's not really a fault of the employees, just the logistics of the business.