Why do you remove logs from the mail servers daily?

In an effort to help keep our users anonymous we remove logs off our mail servers daily.  This helps ensure our users remain anonymous to us as well as anyone who may be snooping around.  You would be surprised what can be revealed from basic server logs about it's users.  Unlike other vendors who "claim" they don't do any logging we run a professional service, which requires us to at least have near real time logs to efficiently manage the health of our platform and performance of the service our users purchased from us.