At Phat D's Customs, we understand that bikes generally do not have the easiest of lives. Detailing a bike, not just cleaning, will dramatically extend the lives of drivetrains, pivot bearings and wheel bearings, as well as any other moving parts on the bike.
Whilst most riders have good intentions when cleaning their rigs, generally they are not reaching the areas where gunk and grime builds up. Most mechanical issues with bikes really end up being grime, dirt or other foreign bodys stuck where they shouldn't be. This can cause unwanted wear and/damage.
If you are going to spend bulk coin on your bicycle with premium parts, it is neccessary to understand the maintenance that is involved.