50 day life is a huge generalization. Some skis can go much longer, especially if they are not skied in bumps or by a large person. I can't imagine my wife wearing out a pair of skis as she skis slowly and cautiously. Some brands- I will make no claims for which- seem to hold up better. Years ago I was told that Volkl's wood cores were carved to the shape of the ski, so they held their shape/camber well. The same person told me brand K used wood cores with no camber and the camber was created in the mold. The implication was that the latter skis would return to their camberless shape with age, used or not. This person's advice correlated with my experience, but ski design and companies have changed much since the late 80's when I was given this information by an industry insider.
I will add that I have a pair of the original Volant PowerKarves with well over 50 days, and at least 8 years old. I have not noticed deteroriation in performance. (Early Volants didn't have any camber to start with, so that isn't an issue
Anyone else seen significant differences in the life of different brands? LewBob
PS My experience with worn out skis is that they lose life, edge grip, and stability. Fiberglass skis were especially susceptable to softening up, torsionally and longitudinally with use. Then they became powder skis or were used in soft bumps. The original Rossi Strato is an example. They were great on hard snow but too stiff for powder when new. As they broke down they became much better in soft snow.