Unless one appears to be damaged, I do not believe it would be necessary to changed at every lube (especially if lubes are every 10,000 to 12,000 miles). I just cleaned and reused mine on the first lube, and replaced on the second lube.
This is what I was thinking, the ones I took out @ 13,400 looked as good as the new ones, that is if you could tell a bad one from a good one

Don.