When I counter offer, I am effectively saying “no” to the current asking price, and that means that there is no longer a deal on the table. As far as I understand (from a non-lawyer perspective), if I decline the counter offer and change my mind later, the seller has no legal obligation to honor the price at which he offered the domain name. In an effort to save some money, I may end up losing the opportunity to buy the domain name. That is a big risk when countering, especially if the counter offer is reasonable...
