Part throttle kickdown setup.

There's a lot of those "hey I have one of those I will sell you" posts in non-sale threads. I often look the other way.

What else would they do?
Do they then agree the guy that needs the part go make a wanted add, and then send a link to the guy that has it and then go from there?

Or private message the person so no one else knows he's getting what he needs?

Am I missing something?