I've been really lucky with my egg customers. I've only had one complain about the size of the eggs when I only had young pullets laying. He bought 10 dozen every time he came to Texas from Arkansas, though. Once the eggs got bigger, he never said a word. He has given me baking size pumpkins, a new wristwatch, and other trinkets in appreciation of the eggs. He still pays for them, and his wife sometimes slips me a few extra dollars cause she says I'm too cheap on the price! If I have extra eggs, sometimes I put an extra dozen in the sack as a surprise.
A lot of my customers give me things like jelly and vegetables from their gardens. They always insist on paying for the eggs anyway. These are the ones that I throw in a free dozen for every once in awhile.
It is sad that people just don't respect other people or their property anymore. As good as our egg customers are, we have a gate at the end of the driveway with a sign on it, No Trespassing...Bad Dogs, and it is closed and locked when we leave. And the DOGS are turned loose! If we didn't, we would not have anything left. Before DH put the gate up, he had a lot of equipment and tools stolen.
I'm sorry you are having a hard time with some of your customers.
Jean