Here's my 2 cent opinion on what's going on with Yamaha slider wear problem. After 3 days in a row of changing sliders during 200 mile runs last season I have concluded that any snow that is kicked up into the tunnel gets melted off from excessive heat generated by the exhaust system, thus warming up the sliders. All the other none Yamaha sleds in the group had so much snow caked up on them you couldn't see the rails and swing arms. The snow build up is what I believe is keeping the rails and sliders COLD thus no slider wear on their sleds.
Check out other makes for how much snow is in their suspension then look at yours, you'll see what I mean. The only thing that I did find is that the faster I went the cooler the slides got. My theory here is that the added air flow is evacuating the heat inside the tunnel in turn allowing the sliders to operate at a lower temp. BTW, the trail conditions I'm talking about is freshly groomed trail which had set up over night where the surface was hard and crusty (riding temp ~ 25-30F). Again, the other make sleds had ZERO slider problems in the total 600 trip.