Who has told a buyer that what you have is not what they need?

Successfully one time (on a rifle that wasn't good for what the guy wanted to do with it (he didn't want a long-action and the Rem 722 has one) - still stuck with it).

Unsuccessfully, when a mom bought my old '90 Bronco for her 18 year old son - told them it really wasn't a good car for a young man (which is why I was selling it - my son had proven that one too many times) - got a call a few days later asking about the winch, then, another call a few months later - transmission was out...