I might bargain...after I see the item. I am not going to lowball someone without seeing the item first. If someone tries that with me I may just raise the price. I had a set of ladder racks for a full sized pickup for sale on CL. I had them listed for less than half of what a new set sells for and was throwing in some extras. First two emails wanted to know if I would take half the asking price...no, but I will sell them to you for $100 more

I ended up selling them for the asking price. CL seems to really bring out the flakes sometimes. I really could care less to haggle most of the time if I feel it is a fair price. I know what I am willing to pay or sell something for. FWIW I usually do pad my prices to allow for some haggle room just for those that feel so inclined.
Aaron