A few years back, when the stock market was going up all the time, we had people ‘day-trading’ and losing their heads, money, and then killing themselves. But usually the stock market is not that volatile to give a gambler a ‘rush’.
Gambling is an addictive behavior – and for people who are susceptible, it works pretty much like a drug addiction. They give up everything and then borrow and steal to have money to gamble.

The GREATEST PROPORTION of investors come out ahead after 50 years of investing.
The GREATEST PROPORTION of gamblers take a loss.

…but then every investor wasn’t 100% invested in in Enron, now were they?