When I wax my skis, I can feel the warmth through the skis when I'm done spreading the wax. I'm wondering if doing this again and again may accelerate the aging of the skis.
Heat in general accelerates the time effect on systems, because it artificially increases the kinetic energy of a system (usually liquids) and collides molecules the same number of times they would collide at ambient temperature over a much longer period of time. Further, heat brings certain reaction to their activation energy, allowing them to proceed.
I'm not familiar with what (if any) chemical adhesives may be placed between layers of skis, but the integrity of that adhesion certainly can't be helped by 150 degrees celsius of energy bombardment three times a week.
I would further posit that the heat of an iron compromises camber (and rocker).