The vast majority of folks who sell on the secondary market are not the scalpers and flippers. I have chosen to NOT buy from those few people, but that won't stop me from buying any second-hand Busse ever.
I sell knives, and I sell them at a markup... but I have never bought a knife knowing I was going to sell it, and I have definitely never bought ten of that same knife to re-sell it. And I don't buy knives from those who do.
I have proxy'ed three or four times as many knives as I have re-sold for a profit, and have often offered knives I had listed at a profit to other dogs at cost. No amount of hemming and hawing or excuses will make me think the scalpers' actions are anything other than greed.