Playing gambling is also a mistake. LOL
If you lose a bunch of money through gambling then it could be a mistake. I think that the people that make money through gambling don't really look at because it usually requires around two people to make money and both of those people usually know what they're doing when they choose their picks.
i think its not all the gambling games mate as that statement will only reflect with pvp games but with luck base and sports gambling its all about winning against the house and usually its already a mistake not realizing that the house was built to win and they didn't create a charity to allow players to win big unless if the player really got a lucky day.