The D4 is truly and amazing peace of engineering. Would I like to have one...sure! But, given my level of photography, the unit itself offer far more features that I need....at this stage at least.
As for the price...it is all relative...personally for such an equipment I think the price is fair. After all, think of how much sports enthusiast pay for their hobbies. i.e. new off-road dirt bike, a boat, or jet ski..etc..etc.
A full-frame body is going to be in my bag on day for sure...but for now...my D7000 does everything I need and more. For those of you that do end up getting one...my hats off and enjoy your new master peace.