I would have countered with $2400 with monthly payment of $400 up to 6 months. And would have stayed firm.
You can send reply like this if you are still willing to sell.
"Hello, I have thought on your offer it's too low from my expectation. Last price I can do for you is $2400 only because you...
Afternic has many such domains listed for sale, whose owner changed. In fact I own few domains which is listed on afternic for buy now price by previous owner. I contacted afternic support to remove those from sale but no response from them yet.I have also contacted seller as well.
Also one...