I've been wearing hearing aids for many years, I've bought my 5th set of hearing aids.
First let me say it does not take a doctorate or a masters degree to get fitted well for hearing aids. Therefore an audiologist title is not necessary. My best fitting ever was a Hearing aids specialist at Costco and one in private practice prior to my going to Costco.
I need high power hearing aids and Costcos do as well as I can get for my loss. I estimate I saved $2,000.00 going to Costco.