So in this example, the un-insured buyer pays an extra $15 monthly....let's say they pay it off in 30 years....that's a savings of $4800....but it cost them an insurance premium of $13590 (which they were charged interest on....and someone neglects to mention that PST is payable UPFRONT on the premium...so an extra $1087.20 due on closing)...all in all, a net cost (loss) of $9877.20 when buying the insurance.   The author should do the math before going to press.