Debatable. Other than that one would likely take better care of a Dura-Ace equipped bike over one with Sora, how do you figure the more expensive Group will last longer? In fact, I'd dare say that the consumables on the higher end have a much shorter life than the lesser priced ones.



More dollars will get you lighter weight, more precisely machined parts (which amounts to better, more precise shifting) and, of course, the Bling that only Dura-Ace, Super Record, and Red can add to your bike.