When we used to work in recruiting, we always used to cringe when we extended a job offer and the candidate excitedly accepted on the spot.
“Don’t you have any questions?” I would inquire. “Are you sure there isn’t something else you want to find out?” I would prod.
Ho hum, the answer was typically no. If they only knew they were leaving money on the table! Hiring managers often told me what amount I would be able to go up to and if there was an issue, there was typically sign-on bonus money available, too.