I sold my few pieces of nice postwar Lionel for what I thought was a fair price for buyer and seller. I have never had a lot to start with and most of it came via bargain auction buys. I have a few I plan on keeping such as the 2046 my dad got me back around 2004, the 2332, the 773, and the 736.
As others have mentioned, for average quality postwar I can hardly give it away. I'll likely donate it back to my TCA division and let them auction it off again.