I don't know why other people do consider gambling as a way of investment?
Because they are lazy and ignorant fools. There are people who legit believe that there are certain methods you can utilize to continue winning, regardless of what type of gambling it concerns, which is beyond insane.
Every method works till it doesn't. Luck can make you win 10 bets/rolls/sports games in a row, but also make you lose in a similar way. It really seems that people want to do everything to avoid thinking about working for their money....