It's only priced that way due to amount of work involved.
I reckon if demand wasn't so high for high priced items the price would inevitably drop but not for long while.
In the end it's all about aesthetic values. Some people prefer ornate and ostentatious while others like simplicity.
I don't have 4000 razors in my arsenal but I've yet to see someone report their Tamahagane or even pattern welded steel shave better than the rest.
For all intents, pattern welded steels are not necessarily better than a mono steel of similar carbon content if both are heat treated correctly. The difference is only aesthetic.
Taken from here
More over, you'll never catch me paying 300-400 on Dubl Duck or Filarmonica. Masses have raging hard-on for them. But the scales on the latter are boring. I wouldn't know this because I don't have it on hand.
People like different things and that's given. They like to hunt and gloat and when they acquire hard to find items. Usually it stems from whether or not you've got the money to dispose and the other person you're competing against has depleted their funds. In all honesty, if someone has all the money to burn that's great. It's their own money and I can respect that as I wouldn't want someone to dictate me what I should like or not like.
That said, for the 300-400 I'd prefer to spend that on a Japanese straight. I wish I'd started out with a JDM straight-it's a lot more forgiving and easier learning curve-not to say I had horrid time with western. To each his own. JDM FTW!