I think probably one of the main reasons people crack edges a lot on suspects is that they don't detune edges before hitting rails. The sharper an edge is, the more it'll catch on a rail, putting more pressure on the edge and therefore cracking it. All you have to detune is about a foot or so right under the bindings, and you're good. I've seen a lot of skis known for good durability get wrecked because they haven't been detuned, and a lot of skis known for shitty durability last for a long time because they were taken care of properly.
Actually a lot can be gained from watching 4frnt tech talk on nstv. I'd reccommend it for learning a lot about basic ski care, etc.
just sayin. Cheers