No, and I doubt I ever will. The equation is ridiculous. You pay $2000 extra for a moderately more comfortable experience for 14 hours, or you have $2000 with which to extend your travel by a fortnight to a month.
Seriously, if you don't fly economy class, you're a spoiled douche who has his priorities wrong.
Hughento, you have to keep in mind that $2,000 to many rich people is like the coins in your pocket are to you - essentially nothing.
An economy ticket from Frankfurt to St. Louis can cost anywhere between €450 and €650 in most cases.
You fly to St. Louis? Bizarre. I bet not many Europeans do that. What the hell's in St Louis? Well I guess it makes Germany look pretty damned good when you get back.