Is it not that a Cartridge is extremely Fragile and all with a time served experience are knowing there is a Cart' going to be lost, so a spare at hand is not too strange.
This does add to the momentary heart flutters when carrying out certain management procedures for the Cart'. I have stopped Hand Cueing, it helps with my needs.
Spare Cart's are sometimes available, as used Cart's are not sold on, and a model is purchased that has superseded them, over a long period a collection can be acquired.
A Cart' certainly does not need a 1000 hours usage to warrant replacement, some like myself have moved on at a few hundred hours.
I have a Hana SL that is with approx' 100 Hours when superseded after a short period of usage and is now owned for 4 years at least.
The length of ownership and limited usage does not bother me, I have camera Lenses that cost more and have maybe been on the Camera for approx' 500 Images being captured over 6+years.
A Cart' and Camera Lens are a Tool, one is vital to capture light and enable the capturing of a Image, the other is vital, as it tracks a groove, which drive coils, generate a signal, to be transferred to the Point it is to become Sound.
The Cart' is Sacrificial and will not remain as a optimised performer throughout it usage life, swapping out prior to the Styli being worn, is OK.