+1
More than what you can negotiate I'd say it's what you're worth. The problem when posting a salary range is you get this really young person in, great communicator, super positive attitude, and you think to yourself "I'd like to take a chance on this person, but they have no history, so not at the posted salary". Then you have to drop them cause they expect the posted salary range.
Posted salary range is for bus drivers and gas station employees, not for sales.