I still don't think you should be going through 3 pairs of skis in a year. To help maintain your skis, make sure to bring them inside after a day of riding, wipe your bases with a dry towel and let them stand with the bases out if they're leaning against a wall. Filing any burrs, nicks, or cracks so they're smooth on your edges will help a lot as well, along with other regular maintenance like waxing.
May I ask what kind of skis your riding?