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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.
If you need to replace a cheap nozzle after each medium-sized print with abrasive filament, then I'm thinking print quality will suffer towards the end of a larger print (like >250g, but definitely >1kg). Not having to replace nozzles mid-print makes the $70 nozzle seem like a better deal. Depending on what you print and how much you print, of course.