I paid about $900 for mine last November (all costs considered). It was the last missing piece to complete my Fellowship and I don't regret it.
Some thoughts that pop up in my mind:
Sometimes you win, sometimes you lose.
In most hobbies other than collecting, you won't ever see your money again after you've spent it - in collecting, most of the time, you can get at least some money back (in addition to the joy you had while receiving and having the pieces).
Is an Orthanc "worth" $ 1000?
Is a Moria Orc Swordsman "worth" $ 800?
Is a missing package "worth" $ 300 less?
Is a small repaired crack on a Balrog "worth" $ 400 less?
Common sense simply doesn't work with this kind of collecting!