Just some tips on edges.
1) Detune with a file. Heavily. If all you are doing in gummi-ing, you are not detuning enough. When we detune team skis, we heavily detune the ski +/- the mounting mark about 20cm in each direction. We first do a 45 degree angle, then blend the edge with 30 degree and 60 degree passes, with some round over passes to make everything as rounded as possible.
95% of the people that tell me they detune their skis and then send us a photo of an edge crack have not detuned nearly enough. A gummi is not sufficient.
2) The enemy of edge cracks is water. Cracks are one thing. Not sealing cracks is another. I've got employees on year 4+ on the same park skis they got when they interned here and still going strong.
Cracks are primarily impact related, not wear related, so they can happen day 1. Metal to thinner metal, regardless of how you cut it, is a losing battle long term and eventually cracks will form.
If you get edge cracks, seal them with a bit of two part epoxy and a c-clamp. Keep the water out. Edges pulling out in mass occur when water gets in the cracks and freezes, expands, melts, freezes, expands, melts, over and over and over. Keep the water out and the skis will last. That is true of any ski. If you get an edge crack and leave it, you're just letting your investment breakdown.
3) At minimum, swap your skis. In about 3/4 of the edge complaints we get, 3 edges are 100% good to go. 1 edge is blown. Why? Sliding same direction and not swapping skis. I'm not here to tell people to slide both ways. I cannot dictate skill, though sliding both ways helps a lot. At the very least, swap your skis to double the life of your edges. Sliding both ways will increase it even further.
Lastly, on our skis. If you have edge damage, we fix it for free to the best of our ability. Send the skis to us, we fix them for free, and return them. I think it is obviously best that people have the knowledge to maintain their own skis, but in the case they get past that point, we're happy to fix them and get your skis back to you.
Hope that helps.