My local minor league hockey team would have the concession stands staffed with volunteers, and their tips would go towards their kids sports teams. This wouldn't be so bad if the food prices reflected the fact that they weren't paying for labor. A can of beer for $14. A small hotdog for $8. Popcorn for $6. And then you get told "I'm a volunteer, all tips go to support my kids team". It was hard to train myself to hit the "No Tip" button, but eventually it got easier.

And then, as if it couldn't get worse, they moved to a new arena that has completely automated concession checkouts. You grab what you want, put it on a counter that has a camera and it tallies it up for you. It's an amazing process... but then, it asks you to tip.

And while I'm bitching... they also went ticketless, all tickets require a smartphone. And they charge for the convenience of them using my device too help them deliver tickets. Same with parking, must pay using your phone and there's a $0.50 convenience charge.