John
From my expierces in buying and selling--
If they do not make an offer or counteroffer they did not have a serious interest in the beginning. Too many "buyers" are actually just lookers.
I had the same experience at Cabelas a couple of weeks ago with a W&C Scott that I had been looking at. The fine gun manager asked if I was interested and I said -yes, which was a realistic answer. He said "make me an offer", which I did and he accepted
(relunctantly). If I had said nothing or delayed it would have been an indication that I did not have the interest or ABILITY
to buy it. I think lack of ability to buy is a key reason so many do not make offers.

Regards,
Leighton