Hmm server has emptied again. Told you Hardcore was hard to fill!
Looking back in the logs over the last few days. The two main reasons for people leaving seem to be;
Teamkillers - Annoyingly people don't seem to use the !punish command and instead just leave. I've set the auto kick for a lower value but I'm not sure that will help if the victims of teamkillers leave so easily.
Metro Rush - Now this is truly baffling. On normal mode this is probably the most popular map. On Hardcore it doesn't seem popular. Is it that much harder to attack/defend on Hardcore without spotting and the radar etc, that its no fun to play?