Well, we have PvE in Skirmish now. It is rarely used. The main problem might be that it is called Novice Deathmatch and you are fighting Practice Goldfish A. Scrubs don't want to do that. It looks like a tutorial. They want 'real' matches. Change the name to PvE Deathmatch, Challenge, or 'Exterminate!' and change the ship names to 'rekt', 'Your Mom', 'Ownt', etc, and have them spit out random chat things like "goin to rek u!" "hax!" and "reportin u!".
Scrubs will never leave.