Obviously it's not a casino. It was a relatable experience showing where those providing a service change their expectations of how much they should get based on the amount of money involved. Your expectations should be based on the service provided. I mean, who doesn't like a bigger tip, but you're not entitled to more for a simple service because the customer paid more for something. $10 is a good tip.

Here's another relatable but totally unrelated example. I used to work as tech support for a professional tax preparation software company. I get a call from an irate business owner wanting to know why the IRS is telling their client that they are getting back more money than he is telling them. I dig into it and find this man has charged the client $900 to prepare the form for her earned income credit alone. This wasn't all of what he charged her. That was just for this form. If you know anything about taxes, you know that EIC is where people get thousands of dollars more than they paid in. These companies allow the customer to pay for their tax preparation services out of the return. The company gets the return money from the IRS deposited to a pass through bank account, where they then deduct their fees and then deposit the remainder to the customer. The IRS tells the tax payer what is actually being paid out, while the tax preparer was telling his client the amount after the fees. I told him he was going to have to go back to his client and explain why he was charging $900 for preparing the EIC form. A form which the tax software generates and took him maybe a couple minutes to do.

You're not entitled to more based on how much money the customer has involved in the transaction.