I'm running mine year round on my minivan...why???
2 reasons -
1. We live down a 15 mile dirt road that easily turns to mud in the summer rain storms
2. Our Hankook W409's (NO studs) have superb traction, great highway riding tires, and they were cheaper then any all season tire that could give the same traction capability for our dirt roads in the farming area where we live.
I'm not seeing ANY sign of faster wear then any other normal all season tire honestly, we have 15k miles on them now, they still look brand-new.
The cheapest, yet good quality tire we could find, all season, was only $5 less per tire, but didn't have nearly the same traction rating....and I personally didn't have the funds, nor see the point in buying 2 sets of tires....have no place to store another set, and this van probably only sees 6-8k miles a year at most.