90% of clutch disk wear is done when moving from a complete stop
 

Do you agree?

I don't know the exact figure, but I would agree the majority of wear is from initial take off.

I agree
Now what do I win!

Maybe if you are an idiot and don't know how a manual transmission works. It takes so little power to get a vehicle to move off, so if you rev the engine to high heaven and slip the hell out of the clutch just to get it moving then maybe.
The real clutch wear occurs during shifts, lets say that you go from 1 to 2, the synchros brake the output half of the clutch so that 2nd gear is engaged, and now you go to engage the clutch and the engine speed should still be above the new clutch speed, and now the clutch acts as a brake to slow the engine. (clutch wear, if the shift is quick, or even just brisk) a granny shift give the engine time to drop revs. or a low moment of inertia flywheel allows for revs to die when the throttle is closed.
The same is true on downshifts unless you bring the engine revs up, the clutch can do it, if you want (more wear)

Are we talking about all cars in general?
If so, I agree with you.

But if we're talking directly about our "torque-deficient" RX8 (like I thought we were), then I still reckon the majority of wear occurs during initial take off (well, at least in my case).

Afterall, we've got to launch the 8 pretty hard to extract its best performance, don't we? :D :D :D

But of course, rev away