Well...that explains the 3300 session id's every day on that server

I'm always cleaning out the /tmp area.
You might to want to double check your math though...I think you added an extra "0" in your enthusiasm !

I was starting to wonder....are those hits from Webalizer? I just checked your site and it had a pile of "people" online.
Are they actual visitors or spam-bots trying to find a hole and "advertise"?