I understand the theory of what occurs but in real-world experience, how exactly do you know?
Aurally, it sounds smoother and more extended on either end of its fr. It probably tracks slightly better as the suspension softens a bit.
Is the effect subtle, transitional or abrupt? Is stylus wear part of the break-in process? Is there more value on the resale market for a cartridge that is broken in or is it just considered used and possibly abused?
The effect is gradual -- but perceptible. Stylus wear: strictly speaking, no. More value -- no.
