I'm having trouble understanding how the tip of the OP's ski would wear like that while skiing. How do you cause that kind of wear without also wiping out? It seems to be too far forward to be done in the act of normal skiing. I think the damage happens when you are not actually skiing. Some ideas:
1) Damage from the storage method - sliding ski into some tube? Spearing them into the snow bank to store them upright during lunch?
2) Damage during transport to/from the mountain
3) Damage from something done while tuning
4) Damage from compulsive destructive behavior while you are bored. Like repeatedly ramming your ski tips into a metal pole, trail marker, or other inanimate object while in line for the lift/waiting on someone. Or whacking your ski tips with your ski poles. I see a lot of people doing the latter, and I used to do this myself.
1) Damage from the storage method - sliding ski into some tube? Spearing them into the snow bank to store them upright during lunch?
2) Damage during transport to/from the mountain
3) Damage from something done while tuning
4) Damage from compulsive destructive behavior while you are bored. Like repeatedly ramming your ski tips into a metal pole, trail marker, or other inanimate object while in line for the lift/waiting on someone. Or whacking your ski tips with your ski poles. I see a lot of people doing the latter, and I used to do this myself.