I was told not all business is good business, and you can't be everything to everyone!
Whoever said the customer is ALWAYS right never ran a business or went out of business a long time ago.
Some will take advantage of you if they can. Some think anyone in business is loaded.
I knew a guy that worked for a big box store where cutomers were allowed to bring back partially used cans of paint no questions asked. I don't believe that store is in business anymore. People were using what paint they needed and bringing back the rest for a full refund!
Don't get me wrong I always go out of my way to please a customer, but there are some real pieces of work out there! No pun intended!