I've watched the TV show on a few occasions (for a laugh) and not for long periods. I've seen them offer a sprinkling of Case, Hen and Rooster, Kershaw, Gerber, and Victorinox. Other than that, the knives I've seen on the TV show are junk.
In my opinion, collectability (from the perspective of increasing value over time) and Cutlery Corner do not go hand-in-hand. They want you to think so, but NAH !