A spare affordable car for bad weather, errands, or emergencies is legit. Mine has saved me a number of times when my primary isn't available or I don't want to use it. Dead battery, flat tire, or any number of things where you don't have time/ability to fix it on the spot. You have a 2nd car to get in and go!
A spare car can be very affordable. A few thousand dollars up front, cheap tags, and storage insurance on whatever vehicles are not being driven. I doubt my inexpensive extra car costs more than a couple hundred dollars annually. The utility value far exceeds the economic costs, especially if it's a different "type" of vehicle for versatility. Car+Truck, or Car+SUV, ideally something with AWD or 4x4.
If you can turn a wrench, fix stuff or identify it and get it to the shop proactively, it's not that expensive.