Because the bikeshop has worked its vaporising magic on your critical capacity, it will feel fine - better than fine.
It will feel like you are garnering essential truths from a grease-stained guru.
Bikeshop Guy tells you that small bottle of chain lube is cheap at $24.99, it is cheap.
Bikeshop Guy tells you the new year's models of Treks are no good, they are no good.
Bikeshop Guy tells you you are mad to run Ultegra, you are mad to run Ultegra.
Bikeshop Guy is a thin, earnest, bearded version of Big Brother.
BONUS TIP: Try not to make important life decisions in a bike shop.