Hmm, that's poor. https://bugreport.apple.com/? (Or can I only access this because I'm a registered developer?)
Brings the incentive back: if Apple doesn't fix things, there is still a public record of the open bug.
Prevents people from wasting time writing up the same bug over+over.
Also increases the likelihood of getting fixed: if somebody else sees your open bug at openradar, they can file a second bug at Apple. Apple detects that they're duplicates, which "votes up" your bug.