From a DBF's perspective:
Designer women's goods (particularly shoes/accessories) vs. designer men's goods are in two different worlds when it comes to craftsmanship. I would subscribe to the theory that some women's clothing is very well-made (I've seen some St. John's stuff that looks like it would hold up pretty well) but on average, it isn't constructed to last. They appeal more to the aesthetic senses than the functional senses. Men's clothing, and that is to say the items in the same price bracket as the clothing/items that you fine ladies are fond of, are typically built to persevere for 10 to 20, and on up in years. This cannot necessarily be said for the cashmere or Super 180 wool suits made by Kiton, but the hours of actual work that go into them are second to none, especially for ready to wear. When we get into bespoke goods, it's an entirely different world with the accompanying price to boot.
That being said, do I need 800 dollar shoes? No, probably not. Fortunately, however, I can wear my 800 dollar shoes for the next 20 years, most likely every other day, and with the proper maintenance they will look fantastic. That isn't to say I will, but then again, men's shoes haven't changed a whole heck of a lot in 80 years. Can the same be said for a pair of Chanel heels? Doubtful. I do like the fact that I see Chanel purses that have held up for many years, and look good doing so.
Designers of women's high fashion typically aren't about the "utility." They want you to buy it because it's "cute" or "in style".. My girl and I are in the mid-100K salary range - we cannot afford to spend 3,000 dollars on anything that isn't classically-designed and heartily-constructed. Your John Lobbs or Edward Greens are going to be better-constructed than your Kenneth Coles and Steve Maddens. It's a fact of life. Is it worth the markup? Only the purchaser can be the judge. They're going to try to get as much out of it as possible. It's a capitalist society we live in; everyone is going to adhere to the theory of self-preservation. If you knew you could make 20 or 30k more at your job (emphasis on DOING THE SAME JOB), would you refrain? Highly bloody unlikely. I, for one, can't blame them.
I find it interesting that some of the driving factors for men to purchase luxury goods and for women to purchase luxury goods seem to be based in the concepts of men being more logical, etc. and women being more emotional, etc. Seems like the producers of the goods agree as that's typically how they market them.
Rant aside, if you don't like 'em, don't buy 'em. Part of what makes them so desirable is the high price - it offers exclusivity, a sense of accomplishment, and for some, increases their sense of self-worth. I'm not sure I'm ok with the last part, but to each their own.