I don't know if this is irrational, but when I offer someone a job and they try to negotiate the salary it makes me want to instantly withdraw the offer. I have not had good experiences with employees who do this.
Well...I want to withdraw it because I've had bad experiences with people who've done that. Could be me. Could be a weird sample. As a buyer of goods, I almost always ask. However, employment is relationship oriented, and not transactional. Also, depends on small or big company.