$800 shoes are manufactured by one designer. The style is exclusive to them. They invented the look, and are the first to bring it to market. They get to charge whatever they want, and the market will pay for it, assuming demand. The major fashion houses only produce so many, so demand usually outstrips supply, further justifying the cost. Let's call it reimbursement of development costs. Nevertheless, when the knock-off shoe makers copy the designs and create a counterfeit version of the product which sells for $50, the people who can and will pay $800 for the original designers shoes, will still pay $800 for the genuine article. Why? Ethics, bragging rights, self-satisfaction, honor, elitism? Take your pick. Those who want the exact look, right down to the original designers trademarks, will buy the illegal counterfeits. Those who are slightly more scrupulous, will buy the mass produced knock-offs by other shoe makers, that look like the designer shoes, but without the trademarks, so people don't think they're wearing the real thing. And that's the world of fashion.
The Watch is no different. Samsung will knock off the design, and the Chinese will flood the market with counterfeits. The big difference with Apple is that the competitors can't really duplicate the internal proprietary engineering or software and still undercut Apple. However, for those who want people to think they can afford the Edition, there's a guy selling electroplating of your stainless watch right here on these forums. Or maybe they just prefer to wear gold over silver, an affordable option which Apple hasn't offered yet. Take your pick. The wealthy will have the satisfaction of knowing that they have paid for an exclusive and limited edition that is fully authorized by Apple, and covered under warranty, crafted with a patented and proprietary process no one else will be wearing. And they are paying for the engineering that goes into that select and limited production. It's the price of exclusivity.
And here's one more for you -- unlike a Rolex, the Watch can be considered 100% a business expense that can be written off and depreciated on your taxes. So the $17K watch makes an excellent write off for the wealthy who otherwise would have to pay hefty taxes on that $17K. Apple's Sr. management is making it easy for their rich buddies to invest in the watch. Something luxury watchmakers can't do.