I get there's a lot of sentiment that's wanting to maintain a certain 'community spirit' within BST.
Fact is—BST is a marketplace. Sellers and buyers participate for different reasons. Buyers may want a good deal; trade up to a higher tier of quality; try something different; finally land that 'unicorn,' etc. Sellers—have varied objectives that range from 'thinning the herd'; moving knives into kitchens where they'd be used; and to make money.
My view is that the majority of buyers are market savvy—no need to be overly protective of newbies—buyers I know generally do research, as with any secondary market.
If a Kato or Shig is being 'flipped,' no big deal, don't buy it, someone else probably will. If someone sold a Kato for $900, and it comes to market a week later for $1800—the potential for bad blood is between the seller and buyer of the $900 Kato—as proof of provenance isn't a BST requirement. Original sale price is not my business, current value is of more importance.
I seriously doubt most on KKF desiring a Kaiju, would pass up buying one from a well known 'flipper' for $900.
I'm all for the wide diversity of sellers on KKF, it gives me options.
A little off subject—but I'm in the minority, strongly feeling that comments shouldn't be allowed on BST; and final sale price removed, final price should be between buyer/seller. If you want to know current prices on BST—just pay attention and keep notes.