Suggestion threads get read by people inside the company. I guarantee it. Threads in the open discussion area often do not.This is something I have noticed and it is what makes me think that suggestions / bug reports in this forum are more of a social activity than an actual report filed for the devs.
Bug reports get read and are often addressed, but even after fixing it or dismissing it for some reason, it is not common practice for them to respond to the thread.
I am not saying that the above practices are good PR. I am merely commenting on what actually happens. They are not ignored.