Responded to a “Looking For” Request

This has been bugging me for awhile. A member here was looking for some parts which it turned out that I had. I responded with a price (less shipping), pictures and the parts were new so condition was not an issue. The member responded that “I’ll take them”. I responded that the $50 worth of parts would cost $16.25 to ship. I have heard nothing more in 3 months.
Does this happen often to other people?