It doesn't take much of a drop to snap a spring post off! I've seen one on a trackday with the standard cover on and i've seen another that was dropped on the drive with some kind of half cover on. Problem is that the clutch cover is the first thing to hit the ground when the bike goes over.
I dropped my 748 on the track on the right hand side - it had a vented carbon cover and I wrecked a very expensive clutch. I now use a std clutch cover.