I wouldn't think that this will 'wear' on the rims. The contact is a rubber wheel that rides the rims. It also comes with a remote thing that mounts to the handle bars to adjust resistance, but when I used it on the mountain bike, I never bothered with it. I just used the gears to adjust.
You do make a good point though...perhaps I should only use this on the commuter/tourer with the tougher rims, just to be on the safe side.
Found a picture of how it works:
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