The PVR knows what channels I've subscribed to. Why doesn't it highlight subscribed channels, so that I can avoid wasting time on channels that I'm not subscribed to?
Of course, marketing will answer that this is their strategy to sell more subscriptions, and they're right - I usually switch to NetFlix when it happens.
Clicking on unsubscribed channels has been so frustrating in our family that we dropped a couple of tiers (family, cartoon central, etc.), and saved enough money for a NetFlix subscription. Much more satisfying.