1500 US dollars for a refurbished Falcon with some extras? You can fly to Europe, stay a week, get drunk, stoned and laid every night and get the Falcon for the same price. And you'll still have money left to buy the wife flowers.
Ofcourse that's exaggerated, but the same goes for your assumption about regular Atari prices. If you manage to sell your Falcon to some misinformed/obsessed/millionaire collector for $700 I will congratulate you with your commercial talent and/or good luck. But don't expect me or any other experienced users to think it's a bargain.