Because it's hard work using a set of skills they don't have (i.e finding relevant academics to peer review papers, organising reviews, conflict resolution, collecting papers... etc).
Plus they already have to teach like 6 hours or something a week, plus marking, and research. What you expect a 20 hour week from them! Be reasonable! :P
Plus they already have to teach like 6 hours or something a week, plus marking, and research. What you expect a 20 hour week from them! Be reasonable! :P