There's many con man out in the
ebay land, and I also met quite a few, not just in coins but also in other collectibles I deal with.
One guy wanted to buy a limited edition book for half the price I listed, and my reply was No Thank You, he came back with hope you keep your books for a few more years, in a harsh tone.

I haven't met up with non speaking English buyer yet. "I need one of those knock on wood icon. Please!"