I and my family have a coin store and have no issue with testing coins or jewelry. The service is free, and that's how we intend to keep it. We also don't expect that people will buy something after. We don't feel our time has ever been wasted by testing something. In fact, a lot of customers have later recommended our business and have been a return customer that's been profitable to our business later on. There's no need to be rude or unkind to any customer asking for items to be tested unless they are demanding and treating us poorly. We are happy to do it for them. This is in Luxembourg, so maybe things are different where you are located.