Nah... IMHO the portion of the year you can guarantee no snow is too short to run "summer" tires. You'll end up with your "winter" tires on a lot of the year. The way I see it is with my plan I can take my sweet time swapping the winter tires on in the fall without any real concern of an early snow and I can swap them off pretty early when it start to warm up without worrying about a late snow. I also don't figure my non-winter driving necessitates fast wearing "summer" tires.
That's certainly true. However, my scheme allows me to minimize the number of months they're on the car and reduces the wear on them. Ultimately, I'm geeked at the idea of having a pretty much unstoppable car in snow and that means snow tires. 8)