Most high end audio companies carefully select their vendors. They do not allow them to discount the price, or within a very small amount or they will stop selling to them.
This is not rigged to rip of the customer, this is rigged for survival. High end audio is not a lucrative business and cut throat competition will put them all out of business. So over the last decades they have learned to manage their sales end to preserve enough profit to survive. This means that if retailers are caught discounting they will loose ability to buy. I believe contracts are involved and the manufacturers manage sales territories so there are not too many covering the same area.

