You folks who do not tune and bevel edges are missing so much its beyond words to describe. One reason you think its not important is because you have not experienced it. Not dissin' anyone, just hoping you understand a bit more about it. The reason you don't miss the tune is because you don't know what you are missing.
The skis are engineered to ski based on certain edge parameters, those parameters are built into the ski, but, when they cure-and every ski cures differently from another, over a period of months from manufacture-they lose those parameters and are often base-high. In other words the bases are not even flat.
Has ALWAYS made my skis seem TWICE as good as before...Faster, easier to turn, sharper turning, less chatter, more stable, track better....the benefits so outweigh the cost.
Too bad you don't know what you are missing if you don't miss it.