They warm up a few degrees, not enough to make a difference, and if its below 40 degrees, they cannot warm up. winter tires are made with a softer compound that does not need to be warmed up. and no, I do not own a tire shop, but I understand the concept of using the right tool for the job. and making sure I have the correct tires for the conditions I'm driving is cheap insurance.
Hey its your safety. If you want to drive on rock hard tires all winter, go for it. I live in AZ, I don't have to mess around with snow tires. But when I did live somewhere where it was cold, I did put winter tires on my car, because my car carries the most important thing to me around in it. ME! so why would I **** around with something as simple as just putting winter tires on my car in the, I don't know, winter?