Investment and Gambling are but two sides of the same coin. Both can rake in money, and both could leave you penniless as well if you're not thinking straight. But what I believe is the biggest difference between the two is their purpose. Market Investment is made to make money initially, and Gambling, tho some may argue, is primarily there for entertainment. It's up to you to think about the worth and weigh of the two.
Totally agree!
In both cases, people should draw their own line which shouldn't be crossed. Investing constantly and just for the sake of doing so is pure gambling and the opposite.
Even in gambling, if you play smart and look for value, it could be considered an investment.