One of the things I really don't understand about the head-fi community (vs the communities geared more toward home theater and speakers) is why so few actually take a minute to contact an official source when there are questions about a product. It really is pretty simple to do, and it beats mucking up the thread with all sorts of baseless assumptions, speculation, and accusations.
*end rant*
Here are some of the reasons why the LCD4 is at the $4k price point...directly from Audeze.
1) This item cannot be produced at the same rate as their other headphones. They are limited as to how many they can produce per month. The drivers take 4-5 days just to build due to the stretching and settling of the very thin film that they use.
2) The cable is not the same one that has been used on other models. It's a premium quality cable.
3) They are using a premium and rare wood - Cocobolo. This is limited stock in large part because it recently went on the endangered watch list. They are also using aged Macassar Ebony, which is also limited.
*As a side note, my go-to guy for headphone stands is Larry Dale of headphile.com, and I know that he offers similar woods as premium options and they are NOT cheap.
4) As others have pointed out ad nauseum - but something few seem to appreciate - Audeze is a small company. They do not have the resources and facilities of a mass market manufacturer. In addition to their R&D, they have to keep up with their other product offerings in addition to rolling out a new flagship such as the LCD4.
I do not personally own, nor have I ever owned, my own business..but given what I have learned about Audeze as a company over the last several years, I think what they accomplish is pretty remarkable. While I respect companies like Beyerdynamic, Sennheiser, and others, there is still nothing I've heard on this side of the audio hobby that gives me the enjoyment of my LCD-Xs. Not to say I don't enjoy my other headphones, because I absolutely do. I enjoy maintaining a rotation, and I'm sure I'll continue to purchase from these and other companies going forward. But especially as a lover of planar technology (particularly Magnepan speakers!), Audeze gives me a level of reproduction that I never thought I would experience in a headphone. On top of that, every situation I know of where a customer has had an issue, they have gone out of their way to make it right.
Now all of this may not be sufficient reason for YOU to spend your hard-earned money on an Audeze headphone, and that's perfectly fine. As we all know, there are many excellent options to choose from in this amazing hobby. But for the rest of us who love what they bring to the table, I think we can have a pretty high level of confidence that Audeze will have our back to the best of their ability should something go awry.