That is what makes the process so complex. Technology isn't all that difficult to understand if one is willing to learn. Many of the HIS are very tuned in to the various components in hearing aids. Some 'fitters' at all levels listen to their clients; some do not because they consider themselves the experts. I am sure that Costco and other 'big box' providers have a variety of levels of professionals in this area. Costco sells good quality hearing aids made by reputable manufacturers. I don't know this for fact, but have been told that many of the hearing instruments they sell are less expensive because they are models that are slightly outdated; perhaps a model or two behind what is currently being promoted by the manufacturers and audiologists. That doesn't mean they are not quality hearing aids. You educated your Costco provider because you knew what you wanted. That will also help other people who buy hearing aids from the provider(s) you taught. 🙂