Frustration with buyers who make offer, then don't

Has anyone else experienced the frustration with buyers who respond to your ad then don't respond after you've contacted them?

Example: A buyer responded to an ad I ran with a offer that was $1000 below my asking price. (My asking price was nearly 50% less than the full retail price). After I responded that I am interested in discussing and leaving the buyer with my phone number, I never heard from them again. No phone call, no e-mail, no "thanks, but I'm no longer interested".

I have always tried to operate in good faith and with honesty in all of my dealings. However, I don't know why someone would make an offer, then no longer respond.

Should I give the "buyer" a negative feedback? Unfortunately, I have had many similar experiences and each time I leave negative feedback for a "buyer" who operates strangely, I end up getting negative feedback myself which does not accurately represent what really occurred in the
course of events.

Your comments will be appreciated. Hey, maybe it's me???