Thank-you for your custom

So I was at the Golden Ocean today, mentally preparing myself for the awesomeness that is their Crispy Chili Chicken, and I saw this.

Can you see this?  Just in case you're glasses are in the other room, I'll let you take a double take...goodness knows I needed one.

"Thank You for your custom"  Approximately 5 minutes before I sat down and ordered my Crispy Chili Chicken, I saw this exact phrase on the ATM screen after it gave me my money.  

Did I miss something? I mean, I know that technically, I would be a customer...  But do I need to get used to the idea that I give businesses my custom?