Baby is big so doctor wants an additional scan at 34 weeks?

Baby was measuring big at 30 weeks (71 oz), but I have a history of delivering large babies without issue. The doctors wants me to have an additional scan at 34 weeks (probably not covered by insurance). Should I opt out or do you think it's important to get this extra scan only based on size? I am normal and baby is healthy otherwise. I don't mind paying extra for a scan to make sure baby is good but my husband thinks it's unnecessary and they are just trying to suck money out of us.