Cashier's error at the Vic - no reward for being honest?

[Paul Levy]

I go to the poker room's cage at the Vic to buy £1,300 worth of chips. I ask for 11 oranges, 6 ponies and 10 nickels. Cashier stacks them for me, I pocket them and sit down at the £100 game, bringing £600 to the table.
When I stand up and count, I realize the cashier had given me £100 too much. I tell the cashier (not the same one) and ask them to check the tapes to be sure. It takes 10 mins then they tell me I'm right, I've been given £100 in excess and they'd like it back.
They only give me a half-assed 'thank you' - no comp of any sort, no food voucher, not even a free spin at a bloody slot machine.

Standard?