I get them often enough.
They are usually a result of the following.

1) I took a game to a show, someone figured out it was mine and tried to get me to sell it to them.

2) Soneone local is looking for a specific game and looked on the pinmap and saw that I had one.

3) I bought a game cheap and posted it in the “what game did you bring home today” thread. When people know you bought a game really cheap it’s like blood in the water and brings out people trying to buy it.

I don’t really care, but have never sold a game this way.
If someone is going to “cold call” me when something is not for sale, they better have an offer that is strong boardering on over the top.

The two games I get asked the most about selling are Creature from the Black Lagoon and Taito Ice Cold Beer.