When I bought an Opinel #8 Outdoor Folder, and the edge had an average (of 5 measurements with an Edge-On-Up PT50A) BESS score of 553 out of the box (which indicates an edge "in need of maintenance & or repair") I figured there was no reason to ever buy another Opinel.
When I bought two Spartan Blades Enyos with average BESS scores of 359 and 433, I thought it prudent to buy from a company with better quality control.
When 4 out of 4 Paraforce knives at the feed store had BESS scores under 300, with good centering, solid lock-up, decent action, and adequate fit and finish, and the one I bought and used for a few weeks did not fall apart, I began recommending Paraforce to anybody who wanted a knife under $10.00.
When I found a Blackhills Trapper with scores of 1374 and 1400 for the two blades, I bought it for $15 just because it was so ridiculous.
When my wife said that my brand new Spyderco ARK was duller than her thumbnail, I tested it and got an average of 471. I thought this must be the dullest Spyderco ever, and such a rare find must be worth a lot of money.
When a Benchmade Pardue Spearpoint Auto had a score of 98, I was impressed, but I did not buy it because 154CM will not hold an edge that sharp for long.
67 out of the 120 blades I have tested in the past year have had average scores below 200.