I don't print any abrasive materials at all. Pretty much only normal PLA and PETG.
I noticed, that my print quality gradually went down quite a bit, especially in the last few prints. I had a lot of stringing, weird blobs, and scarred surfaces.
Now, the print quality is as good as it should be!
They are dirt cheap. You can get a set of 10-15 generic ones, in different sizes, for only a few bucks. Don't forget that they are consumables.
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The larger photo shows a lot of wear on the end compared to the new nozzle (the flat area on the top is larger). It's hard to tell from the photos but in my experience this generally correlates to a widened nozzle diameter and decreased print quality.