So I say for recreational skiers, don't get too freaked out about the base bevel getting bigger over time. If it becomes a big deal, then one needs a grind back to flat that includes the edges. This is not an easy thing to get. Very few shops can and will do that correctly. Most consumer skis come with lots of base bevel out of the package. It's only a race ski that has no bevel and thus can be tuned to .05 In the process of grinding to total flat much of the life of the ski will be lost.
It is true that if your skis are over beveled on the base edge they must be ground to reduce bevel. However, almost all skis are over beveled out of the wrapper, race skis included.
Grinding a ski flat from edge-to-edge is usually not a huge project on a new ski that is slightly overbeveled at the factory, as opposed to being completely trashed by bad shop or hand tuning. The latter being the one that requires lots of grinding to correct.
I'm just not sure what you are asking here now. Flat it flat and beveled is beveled. Only racing skis come un-beveled. Anytime you grind to flat you reduce the life of the ski. Who cares if you want to buy new skis all the time. Go ahead and have them ground to flat. Good luck with that.