Having an uber expensive bike and knowing with 100% certainty that the bike will handle the type of riding you are doing, will encourage people to push a bit harder than they have previously?
I really doubt this, look at all the nice bikes in the classifieds: no dints, scrapes, excellent condition etc. It would seem that having an expensive bike makes people afraid to crash them.
The point for me is that, for the vast majority of riders, a 20g saving on this, an almost indiscernible amount of extra rigidity on that, a 0.1% increase in potential speed etc is totally irrelevant as they are not chasing podiums. Therefore why pay £XXX for a bike when you could get the same fun for £XXX/2 or 3. It’s just a waste of money.