Pow skis don't typically last that long with rail use, given a lot of companies (like armada for example) like to downsize to 1.7mm edges to save weight. Not that I don't occasionally hit a rail on my pow skis for the exact same reason as you, sometimes there's just a feature calling to you and you're on the wrong skis.
Personally I don't care much about the condition of my pow skis bc you don't notice much damage when you're skiing pow. Getting back to the lift on groomers can be pretty awkward though.