To the best of my knowledge, I only know one person (personally) who owns a WH. I also know the person who bought it for him, because it was a co-worker gave it to him as a going-away gift after working together since the day they both started at our company. The guy who was leaving was (and presumably still is) all about wearing extremely nice suits, ties and shoes, and although he'd never indicated an interest in knives, there is still that notion that a man really ought to carry some sort of knife. There is no denying that, as far as knives are concerned, William Henry makes knives appropriate for that role.
I think that sentiment - that every man should carry a knife - is the basis for WH knives, and it just so happens that there really aren't many production knives out there that cater to the suit-and-tie crowd. Sure, anyone can carry any sort of knife, and it need not be flashy or expensive, but that's sort of like watches. I have a few knives that I think would be appropriate to carry if I was dressed up for some reason (rare) and they range from $20 to $200: A couple of Kershaws, a couple of ZTs, a SAK and even a CRKT. But to be fair, that has a lot to do with me looking at all the knives I own and having a few that serve no other real purpose than for very occasional carry and minimal use. To put it another way, they could be considered EDC if I spent most of my time in board meetings, but that's not what I do.
I suppose I could drive a much prettier car that would be easily as functional as what I drive now, but in my daily life, it wouldn't be practical for the higher sticker price. Incidentally, WH makes knives that cost considerably more than my car did when purchased brand new, so I don't know what to think about that.