it never hurts to negotiate the salary.

one of my former classmate (a foundraiser in his 50's) said he'd always say 'I thought it would be a little bit more'.

when i got a job offer, though it's the only offer in 6 months and i'm sure i would go and i'm satisfied with the salary, i still asked "is the salary negotiable?"  they called me an hour later and gave a 7k+ raise.

even if they can't offer a better salary, you won't lose anything, right?