For the average, nice four panel old door I ask $24. It is the price point here in the Midwest where I don't have to sit on the door forever -- I like a quick turnover.
Which means that I don't make a whole lot on resale -- unless the door is blessed with some nice hardware.
If that is the case I take the hardware off. It hurts to even say it. I simply can't sell the door hereabouts for what the door+hardware together is worth.
sold on ebay for $15.
The hardware is a great seller on ebay and easy to ship. Many times the hardware outsells the door it was on. I know it sounds merciless and cold, but this way both the door and hardware get a second chance on life. Oh, and I get a few dollars in my pocket.