I hope gambling is for short term earning they won't provide any returns with your investment, even it won't have praise increase like bitcoin. Gambling is just a game you will make money when your guessing is correct other wise you will loose. No returns and No Guarantee.
"no returns and no guarantee ", that's right buddy its really hard to predict which way the bets will go but if you are jut doing it to make some fun and you are just doing it to spare your free time its better to treat it like that and just always remember rule number 1 always use only the money that you can afford to lose nothing in excess.