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That's the thing, while says your chain is at 0.5 (using Park Tools chain wear tool), sometime that mean 1 or 2 out of 10 (hypothetically) cog is worn.
While that may not seemed like a good reason to change cassette, they may be the gear you use the most, and can accelerate the wear of your chain, and thus the cassette too, even chain skipping occurred.
In my experience, it is worth replacing both to ensure 100% drivetrain effectively.
Having said that, I usually replace my chain before they wear out too (and using the Rohloff tool), as cassette aren't cheap.
edscoble
Actually Never heard of them exist ed. That would be great to have though.
My thinking is based on the cassette should outwear several chain before need replacing.