I am. I bought the $80 ultimate pack that comes with the two single player mission packs, 10,000 gold eagles, two months of premium and several premium planes. I've put a lot of time into the game and enjoy it quite a bit and felt the devs deserved my money.
On top of that I bought a TrackIR head tracking system to handle free-look in game naturally for $180 + shipping. This game is getting expensive.
Have a friend I squad with that bought TrackIR and bought gold eagles/premium time as well and he's buying a couple extra monitors to set up a 3-monitor system for the game. So that means he's spent close to $500 for this game.
Arcade is just a blast and the graphics in this game blow away any other flight sim I've played. Historic Battles and Full Real Battles also fill the niche for hard core flight simmers as well.