A few years ago, someone made an offer on one of my domain names, and I counter offered trying to get a better price. I don’t recall if the person replied to my counter offer or not, but I followed up within a day or two to let them know I reconsidered and would accept their offer. The person told me their offer was no longer valid.
I was pretty upset, and at the time, I thought they had done something wrong. After speaking with a couple of colleagues, I then understood that what they did was completely legitimate, and in making my counter offer, I effectively rejected their offer.
With domain names or anything else, if you make a counter offer, you are putting the initial offer that was made at risk. People sometimes make many offers, and when you counter offer their initial offer, they might disqualify your domain name from their list and spend their money on another domain name in the meantime. It could also be a ploy to get a lower price, knowing that you were willing to take less and you might have to pay for your negotiation tactic.
Whatever the case is, you should know that a counter offer may result in the loss of the original offer. If you’d be happy with the original offer and you’d regret not taking it, you should probably think twice about counter offering.
I am an advocate for counter offering on an opening offer for a multitude of reasons, but you should know the likely consequences of proposing a counter offer.