“Not many people can afford an insulated garage, much less pay to keep it heated.”
Not necessarily true.
If you have $100,000 for a Tesla S or X, a Lucid or a Rivian you have serious money.
There are folks in my area that heat their driveway so snow and ice do not linger, THAT’S expensive.
BTW my garage is at 71 F currently and it’s 19 F outside (my office is in the garage). Got to go outside and shovel/blow snow!
Only a small percentage of people in the US can afford a $100,000 car. Maybe in your neighborhood a large percentage can.