The person you buy from will tell you a lot about the condition of the bike without saying a word.
He bought the bike to do wheelies and score with the ladies. The law caught up with him so he's selling. Probably has numerous burnout marks in his driveway.
Knows very little about any specific bike, but hypnotizes buyers with loan percentage points and perceived values.
A spotless bike with a service manual on the seat is parked next to his alphabetically arranged toolbox.