Back to the original question...
I finally caved in and bought the Swix Evo Scraper Sharpener last week. Wow, what a difference! My previous calculation was 50 scrapers cost the same as one sharpener. But after hopelessly dulling about 40 scrapers I'm done struggling with the panzer technique. It just doesn't work. Or, it works a little. But when you have 6 pairs of race skis and another 6 rec skis, with kids on snow 6 days a week, dull scrapers that require endless work on the panzer file just plain sucks. This nifty little machine saves a ton of time and effort, and the scrapers are like new. With 40 old scrapers to sharpen, I have certainly bought my last one!
Second best tuning purchase I've made, after the Verdonk Snowglide.
Maybe, but I bet you a beer in Breck you sharpen the scrapers to the nub quicker than you might think.