An auditor is supposed to be capable. We know how easy it is to keep the truth away from him. After the dreams, rather than realities of life. Answer is simple. A set of human weaknesses.
Most people are greedy.
They expect unreasonable profits. So they keep aside reason. A greedy man indulges in wishful thinking and does not want to see logic. A common man is impressed by the grandeur that company promoters and merchant bankers display. He exploits these weaknesses and makes money at their cost.