Clutch should last much longer than the belt. I have almost 13,000 Kilometers on the factory belt and clutch. My belt needs to be replaced badly though.
The clutch does sometimes get residue build up and acts a little funny. Mine started acting funny (shuddering on takeoff) with less than 1000 k and I've read about people having the same issues. Every time I have the clutch out I hit the friction material briefly with 220 sandpaper and clean the bell out good with brake cleaner. Never have any issues anymore.
