While I didn't tip the slot slut at Spirit Mtn. when I got a handpay Thursday, I did tip a security guard twenty bucks the following AM at Chinook Winds.
My car got a flat tire in the parking lot; as a shade tree mechanix I had no concerns about changing the tire myself.
But...I soon discovered that I'd over-tightened the lug nuts and couldn't loosen them on site using the flimsy tool the car came with.
A security guard came over and at my suggestion he went and got a good sized piece of pipe which we used as a lever to bust the nuts loose.
He was very helpful and I had no qualms about tipping him for the VALUE he imparted.