never gamble if you want to increase your money. Gamble only if you want to gamble just for fun.
At first step after some winnings looks like i will have something back, but at the end when i've finished to loose (not so much indeed) i learned that is better only to gamble just for the taste of it, and if win something back, ok.
For the rest, if i want to really growth my money, i think that better way is to invest in something that can give you a known % back: can lend money to others,can invest in bankroll of solid gambling site, can start trading some altcoins....you have some risk but at least it's not lucky related...
as another user said:
Investing: You can lose or win. The odds are not known to you.
Gambling: You can lose or win. You know the odds are against you.