20 hours x $10 = $200. Not to mention the materials you use (belt, bandages, etc.)
At the shop I work you'd get a flat base, bevels set and a nice wax job for $60. Even at $5 hour for your time, you'd come out ahead. And that's just one ski done. As you haven't started ski two, I'd be really interested in a photo of the base with a true bar on it.
That your skis came brand new as bad as you describe is remarkable. I've seen plenty of brand new skis and never one from a respected manufacturer that needed tons of work, much less more than some, to be skiable. Independent brands, plenty. I won't name my 'favorite' 'crap out of the wrapper' winners but they have been concave, convex, rough belt sanded and lots of other things.