wavinwayne., you may spend as much as you want on your bike -- especially if you ride competitively, buying the best equipment you can afford makes sense.
My observation is that occasional weekend riders with fat wallets (or overdrawn credit cards?) spend thousands on bikes they never use to their full potential. Often they don't even know how to set up stuff properly. They als tend to get bored and move on to the next toy. Sure, it's their money, but they still are fools in my eyes. We got a very exclusive bike shop in SF. I recently found out that even the bike mechanics were as clueless as their customers. The tech didn't know what a track nut was, even after I drew him a picture.
The Christini's drive uses spiral bevel gears similar to the one in my bike, but of course the 2WD is much more complex. Since the Christini's gears are open, I wonder what kind off wear issues there are. Also, what grease is used? Finding the right grease for my shaftdrive was kind of tricky.