I used to be involved in the antique photo business, daguerreotypes, ambrotypes, etc. For me, it was just a way to earn a few dollars for my other photographic interests.
I got to be friends with one of the biggest dealers around. His prices were well beyond unreasonable. We are talking thousands of dollars for images that others would have sold for $100 or $200.
I asked him one time, why he did that. He responded, "Because eventually some one will pay my price. I am happy to make a few sales that net me large profits." The thing is, he had regular customers who would gladly pay his prices without question. Yet these same customers would haggle with other dealers over $5. Go figure.
Pete