The expectancy in gambling is ALWAYS terrible, while market speculation at times offers outstanding opportunities.  To get a 2:1 or 3:1 opportunity in gambling, one needs to accept incredibly low odds of victory.  In financial markets, those 2:1 or above opportunities come around like clockwork and offer high enough probability that long-term positive expectancy is possible.  Not only that, but the market speculator has the opportunity to adjust his or her position after the game begins…when was the last horse race where you could take a little off the table after the first turn?  Or reclaim most of your bet when your horse stumbles out of the gate?