Why is it so hard to buy parts from people

I tent to keep anything that could be a "spare part" to a vehicle I have.

Murphy's law applies doubly in that case, as jpar found out.
I just don't have the property to handle holding all the stuff that I think I'd use one day. I was more than happy to get rid of 2 tons of scrap metal and $750 and paid $20 for a fan... There was a 73 power wagon on craigslist yesterday for $500... It was tempting but here we go again....