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Sure, but if you merely ensure proper adjustment in the first place, you can ignore them almost forever if they have half-decent sealing. If or when pitting occurs, it always happens to the cone first because the load is more concentrated on it. Pitted cups are a sign of extreme neglect. If you have caused cups to become pitted, you deserve it.
Also, some cups are actually replaceable.
Kimmo-
some cups are actually replaceable
Most of them are theoretically replaceable, after all it's just a steel bearing race pressed into an aluminium shell like a cartridge bearing, but the last time I saw cups for sale was about 1980, when Campag was still a proper organisation rather than a lifestyle brand with some offshore manufacturing operations.
But yeah, per my original point, they last an awfully long time if you set them right in the first place and do the minimal maintenance.
gbj_tester
As opposed to cup and cone, where you have to replace the whole hub if the cup wears out 🙂