It’s a good thing and fun to have several carts and rotate them But still, you can’t be sure how badly your stylus is worn out unless you track each cart’s usage and check it under a microscope.Hi Aziz - I"m more aware than worried. I try not to get to that point.
I have several cartridges (listed under my system link) and rotate through them ... maybe make a change every 4-6 months. I will buy a new cartridge maybe every 2 years, but the hard part is finding the right cartridge for me -- I found my last one through review. Now that my tonearm universe has expanded with the 3012R there should be more opportunities. I have never re-tipped a cartridge.