If it is deep enough to get a good p-tex filling into it is worth fixing. If not... get them ground once or twice a season. If they are race skis, then you may want to grind more to keep the base fast. You may also want to see if the base has "wrinkled" and is causing the ski to now be "base high." That problem can only be fixed with a base grind unfortunately. I have that situation on my SLR's from last year from running over something in one of our courses. Since they are no longer my "race" skis I have no need to have them ground until they absolutely need it.