I don't often report posts, but when I do, I usually select -not- to be notified. However, I do always seem to get a reply from the respective moderator.
Could this function be broken, or perhaps not indicated clearly enough in your admin panel?
It's not always done, and particularly when it's just about moving posts, I personally do not PM the post reported. However, we think it is helpful to notify how a report is dealt with, so you can consider it as a 'service'.
The checkbox not to be informed only makes sure than when we're effectively closing the report in the system, you are not getting an automatic notification of that.