I'm not a gear flipper, but I can see it another way. If a gear flipper and a dealer have some relationship how do we know what financial transaction is taking place between this flipper and the dealer.
I say that the majority of gear flippers are paying list or pretty much close to it if they get a discount for their gear and really whats the big deal if they sell it. The dealer and the manufacturer each received their money for the sell of a product, and the dealer in most cases orders a replacement.
On this site, lets just say some members flip gear about as quick as I fill my boat up with gas.
Discounts, when we purchase a car we hunt for discounts, and there is even sites like for example True Car that give you a ballpark on what is fair and what is an oversell by a dealer. I look at this the same for audio equipment, TV's, appliances boats etc.. The relationship one builds between a dealer of anything be it, audio, cars etc.. has always been in my experience about the dealers drive for repeat business. If they walk the mile to ensure your getting the best price and that includes a discount and can back up that price with service, I will more than likely be a repeat customer.