Gambling
Gambling exists in all societies as a harmless social diversion for those who can stop gambling at will.
It can be a career for a cool professional operator.
Those who become addicted to the excitement of gambling suffer severe and persistent losses.
Quick acquisition of riches is a common delusion among addicted gamblers.
Even if they make money at some point, they feel compelled to gamble again and quickly bleed their profits back.
Taken from Study Guide for Trading for a Living by Dr Alexander Elder