To start or not to start engines in winter

I've always ran mine once a month for a good 1/2 hour, well within operating range. Once warmed up, I give it a few shots on the throttle, to push the condensation in the pipes out.
Sta-Bil in the fuel, batterie disconnected and on a tender.
I've never had any issues in 25 years.

Oh, and I also close the garage door for 3-5 mins while the car is running, the CO2 will kill any rodent.
Note: the garage is not attached to the house.