Kinda funny seeing people who supposedly run stores having no idea about how economics work. Im working in Retail and here in Germany you actually have to work and go to school for years and pass tests if you want to learn a job and be officially certified that you have indeed learned it and are proficient in it. Speaking with my father who lives in the US confirmed that that isn't really the case there and it shows.
If these guys are representative for store owners all over the US then it's no wonder why comics are just a niche thing at most.