The problem i see with the Ski Saver is the small area that contacts the bottom edge of the ski. ALL of the front end weight of the sled is on the 2 points circled in red in the attached file. It looks like there are "teeth" on the tops of these areas as well, which only complicates the problem. I would think the underside of the ski would get torn up badly during use.
Just a thought . . .
Thats the only way they can keep them from kicking out. Backing up, or going forward, if you catch any bump or ice chunk they are going to try and move forward or back. That hook on the ski tip is only holding them down, they need those teeth to bite in and hold them from moving front to back.
I agree, they are going to cause so wear and tear to the ski bottom, but my ski bottoms always look like they have 10,000 miles on them after one season. Too many creek crossings, sharp rocks from ridge lines and early/late season riding.