I fly nonrev, so I hope like hell that the F cabin isn't full and I fly first or business for free. Theres almost always space when you need it most, on lon transoceanic flights. Domestically I don't get it all the time, but I don't think its that good in the states.
Would I ever pay that much for it? No way, my money is worth more than that.

Personally, to me its not because first or business class is that good. It is because coach is just that damn uncomfortable.