You have a very good point, about studs and miles. It should really depend on where you ride, conditions, how long you keep your sled, and your riding style.
Your riding style will change with and with out studs based on conditions.
I have studded all my sleds, but I ride on alot of lakes and icey conditions in up-state NY. Knock on wood, of the dozen or so sleds I have owned, only had one stud pull out but I don't ride 10 million miles like Rob. 3-4K then down the road the sled goes.
You really need to ride smart to keep the studs in the track, no washing the corners or spining your track every chance you get. You don't see car racers burning off their tires and winning a race. I have seen so many people waste there track with studs by riding like a t-jockey.
Ride smart with or with out studs.
