So say, there are players who are ranked top 50 by diablo3progress.
They are bored to death of farming paragon, and they can't really see any immediate upgrades.
So what they do is sit in AH all day long, flip items left and right till they finally see a gfg once-in-a-month item.
And so they pour all their gold into acquiring said item, which isn't even an upgrade to them, and what do they do?
If its an upgrade, they wear it. If not? They immediately salvage the item to ensure its removed from the economy, ensuring their gear remains top-notch and they stay in the top ranks of diablo3progress for a long time to come. Else they salvage their old gear.
Flip items if you want. Make profits if you want. But stop destroying gfg items!