For me the problem with expensive, top-end knives is that I have a strong hunch they all lie waaaay out on the diminishing-returns part of the goodness curve. That is, every little improvement in fit, finish, and materials costs the buyer disproportionally more than at the lower end.
Given the existence of inexpensive knives (Mora, Opinel, Rough Rider, etc., etc.), I simply can't justify to myself spending gobs of cash on the upper end knives. As many have said here, they all cut.
But then I'm a knife user, not a collector. Collectors can (and will) spend what they like for reasons that are good enough for them. Me, I'm always more impressed when I find a cheap knife that punches above its weight, and these are found down at the low-price end.