Maybe I think like an European, but here it is normal that a shop owner gets a profit margin from a sold item. Big shops have a better negotiation position then small ones, and can buy cheaper.
Point is, that if a distributor wants at least a certain margin and a seller negotiates very sharp then there is no deal at all. And if: on top of that, you must pay for space on a forum with 20 posts/year then maybe it is an idea to talk to each other and find a modus where you both have a profitable business.
Last but not least: these tariffs must be paid by someone, if for instance a distributor in the chain loses here, this might have consequences in the availability of certain audio brands we all like.