I love this one:

■Loss aversion — the tendency to value the avoidance of loss more highly than the making of gain. Losses affect you more than gains. Because of this you become more emotional when making losses, the point at which a rational decision would save you the most money.

Commonly know as quit as soon as your ahead [avoiding any further profit or possible loss ]. What do we do when we are behind? Keep betting or give up the punt?

The natural progression of this rule leads to small profits [quit as soon as you have one] and big loses [just keep betting].