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Waxing will help protect the bases, but you have to remeber that snow flex has really high friction so loads of heat is produced. When you ski on snow, the friction of the ski on the snow, melts a thin layer so you actually slide on a thin layer of water, which keeps the temps in the base very low. On dry slope there is not enough of this water so you end up sliding on the bristles which cuases lots of heat and will infact simply melt the wax out of your bases. If you ride allot of dry slope you will find that the base actually begins to pull away from the edges, as the base begins to shrink from the repeated heating. At this point the skis are pretty much done, there is a gap between the base and teh edge and teh base is pretty much just plastic at this point so will absorb no wax. That kind of thing would proberbly take like a month riding 3-4 hours a day. So if you ride dryslope allot get some old beater skis just for it, and save your good skis for the domes and mountains.
The one good thing about dryslopes is you may break less edges on rails. One of the main reasons edges break is they get heated fast whilst sliding a rail, then when they hit the snow agian they cool very quickly and this is what produces the cracks, (of course some cracks are produced from simply hitting the edge into the rail too), however on dryslope you do not get this cooling effect when you come off the rail, so edges crack wise tend to be better on dryslopes.
