NOT SO!
Retrofitting is actually quite economical. It only cost me $320.00 WITH INSTALLATION INCLUDED!
I had my two car garage door retrofitted with 2 (seven foot) professionally installed Hurricane Posts for only $320 by a Fort Lauderdale company called:

EDL (Electronic Door-Lift, Inc.

They came in and within 1 hour they drilled the holes, set-up the brackets and went over the setup instructions.