You don't ask for more money when an employer offers you more than you already asked for — that would look really bad and like you were playing games. (careerdigital.com)
Or you may feel awkward about asking for more money when you feel like the company is giving you a fair salary. (blog.gojobhero.com)
Why do women have such a hard time asking for more money in job situations? (womenwhomoney.com)