Replying to Wreaked Skis

I got a pair of slightly used vokl alleys 2 years ago and have done quite a bit of park skiing on them, but now they are literally falling apart. The left edges are completely worn away underfoot and some of the wood is beginning to wear away as well. The shops I've brought them to for other minor repairs won't even sell me parts because of 'liability'. However, they still are skiable, even though they are missing brakes and edges. I'm not intentionally destroying these skis and my technique on rails is fine. Is this normal?