Allergic to nonsense bias

When you are confronted with financial salesmanship, you are able to spot and avoid nonsense. Nonsense can be anything from overconfident projections to accounting gymnastics to fraud. 

What is common is a belief that the level of nonsense in a proposition should be proportionate to its marketing zeal. Skepticism, up to the point of cynicism around sales, can be a useful filter that saves you countless headaches.