You may not like bargaining, but you may have no choice but to accept an offer. A lot of times, all you'll get are offers. I'm resigned to consider all offers--but once they start asking for 5-10% off the asking price, that enters low-ball territory. There is an etiquette to bargaining, that's for sure.
I got an offer of 900 dollars on a brand new unopened 14-24mm when my listing price was 1500. That REALLY pissed me off.