This is true but i know a small amount of people who do well as pro gamblers..
Only few gamblers become successful in gambling, because most of the time when we play gambling we can lose often than winnings. This is true even if we try to play gambling now for sure we can lose our money at the same time. So gambling sites owner is very lucky to have one.
Some of gamblers are not become succesful you know why gambling site is cna live long because those players who loses lots of bitcoin and thats the reason why it is good to have a gambling webstmite even you dont have work you can really live with bitcoins because of the profit.