ShipStation replied and they said one no longer needs to put in an insured amount if under $100 for USPS priority mail.
They are now using Parcel Guard for insurance. Under 100.00 is $1.09 for domestic insurance. I wrote back and stated I never received an email about the change and requested a refund for Parcel Guard Insurance charges. They refunded the charges within 24 hours.
$1.09 x the number of customers that don't know this x the number of packages sent is quite a profit.