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I wouldn't think that it messes up skis anymore than hitting rails and boxes.
In an episode of Travelling Circus they make a little course which included a slide
The slide should be fine, I build rails/boxes using PVC pipe all the time, the slide plastic should be softer, so no issue with it harming the base of your skis. If you don't have snow, go by the local hockey arena and take some of their snow.
nothing happens to your skis... its plastic, not sandpaper or concrete or anything that could damage your skis. Sliding rails damages your skis, but that why skis only last a year or two