Offer / counter-offer? Audiogon rules

I like the system as it is set up with the counter offer in place, with that said I made an offer on a turntable, a brand I wanted to try, that was 10% lower than the asking price which the seller declined and I moved on, about 3 weeks later he reached out and asked if I was still interested and I purchased it for my original offer. The seller was a member in good standing and I left him his positive feedback but he never left mine for me, just chalked it up to maybe he was a little upset at not getting his asking price, but who knows. I also use the counter offer system to great effect when selling here and on the other sites. Enjoy the music