Have a colleague at work place who keeps saying that gambling is also investment that in gambling whatever amount you use to gamble can actually yield back the results, he emphasize on that if you are gambling you should do the best to use a better amount to place your bet so that if you win then you gonna have good pay out.
I do not think that gambling is an investment unless you are the gambling operator.
But if your friend sees it as an investment for him, who are we to dispute that...he may have gotten some realization or "enlightenment", that we are yet to catch on to.
Unless you are gambling as your main source of income, that is full time, do not bet any amount that you cannot afford to lose.
Overall, gamble responsibly and create your own gambling philosophy so you don'y get confused with other people's opinion about gambling.