I think looking at Case and GEC shows a lot of the reason that GEC is so popular with traditional knife enthusiasts. Case likes to brag about being the most collected pocket knife, but frankly, other than different scales and the rare old pattern brought back for a short run, there's not a lot of originality in their offerings. Sadly they don't offer a lot of the really old patterns they made 100+ years ago. It took bringing Tony Bose in to add some of that missing element to the line up, and while those are nice knives (I own a few) I really don't think they're worth the price. GEC on the other hand does seem to care about offering the old patterns, and they bring some new stuff out too. Often they are the first people to make a pattern in decades. The 13 series 2011 BF knife (one of my favorite patterns) was the first run since the 1980's offering by Fight'n Rooster, and very scarce by other makers, yet it's a catalog offering in the early 1900's by (at least) six major manufacturers. Case could easily make a run of that pattern, but hasn't. Barlow's are another case in point (pun intended); GEC offerings sold out, and five years after they started selling Case finally got around to bring their pattern out for a short run.
As I see it, it's not pattern so much as quantity and quality. Case has made hundreds of thousands of knives, very few in the past decade that command a premium on the secondary market, and lot's that can be had at a fractions of suggested retail. GEC makes much smaller numbers of knives and some can sometimes be had at a discount when they first hit the shelves, but try finding a good one at any price 3-4 years later. Exclusivity adds value; that's a major marketing law. It helps when you have superior quality control and good materials.
But still, without a fan base both of these companies would probably be struggling. There's a finite market for pocketknives, and I truly believe it's growing smaller.