Sometimes timing is crucial with un educated sellers. I went to a few garage sales that had bikes listed in the CL ad. Figured I would show up early before the good stuff was sold. The seller wants $300 for the dirty, in need of tires, etc Trek 400 since according to seller it would be worth a lot more on ebay. You can't talk sense into him and not worth trying.
It probably sold for $25 at the end of the day since he did not want to drag it back in the house. Right place, right time. I gave up on garage sales in my area.