I usually go on a case by case basis. If it looks like a tourist who is just taking pics to show people at home, I don't make much of a fuss. If its somebody from the show or newspaper and they want pics for marketing purposes, they usually will ask. I don't have a problem with that. If I see someone who obviously is taking pictures to "copy" or if they are writing down prices, etc., I might go walk in front of my stand to block their view and say (nicely) "Can I help you?" Usually, that's enough to shoo them away. I share a stand with my friend who does woodworking and she has this problem all the time. She says that if they are going to copy from her, the least they can do is buy it first. Sometimes a person will actually tell us they are buying the product to copy. Kind of leaves us speechless. What are you going to do? With today's technology, people can take pictures and you don't even know it. The other people who irritate me are the ones who meet in front of my stand and reunite with old friends, relatives, etc. They block paying customers from my stand while they reminisce and catch up.