haven’t seen anyone who is so crazy as you for a long time. Whether your goods sells has no direct relation whether the other are reselling other stuffs, i believe. it happens everywhere in this world, it is just buy and sell. those resell other stuffs is actually selling also their time and services for the buyer. as a buyer, you have 100% right and freedom to go search for the original maker or the cheapest if you had the time and are willing to to do so.
Also, what’s wrong and how ugly it is to have different sellers for an item from the same supplier? when you sell your item, are you going to make a rule that whoever buying cannot resell ? and there is always only one single seller/buyer is allowed?