After spending countless hours on military flights (C-141 and KC-135 in jump seats, at times with my 80lb rucksack on my lap) any commercial seat is luxury. Someone smiles and brings me water, and it's cold? Marry me, please.
Seriously, I'll take the first class seat when I'm upgraded or a contract pays for it, but never would I lay down the extra cash to pamper myself like that. What do you get for that? Free booze? Big fucking deal. You get Glenlivet if lucky for that extra several thousand beans, whereas I could buy 30 bottles of Uigedal for that once I hit the duty free at the far end. Leg room? Get the fuck up and walk around. Flirt with the cabin crew, whatever. If your fat ass needs that extra wide seat, all the more reason to get up and do a few laps here and there.
Oh, yes, arkfarmbear, Gulfstream (or Citation X!!) is the shit. Love it when I can score a seat on one. Getting tougher these days, tho, with everyone in creation being a "VP" and the economy keeping private fleets grounded.