Anyway i think rollin earn alot everyday but i guess there a risk too..
They can lose also since its casino. Depends on house or player luck
Usually casinos win in the long term. I've invested before, and the first few days I lost, but as the days went by my profit started to climb back up, so after a while I withdrew. Some casinos do lose, if they don't have a big enough bankroll and multiple people get lucky at the same time and empty the bankroll, but usually they do make profit.
In the long run gambling houses will surely make profits that is for sure. So if we invest in any good and trusted sites than we can make really good profits without managing any gambling sites. But most of the good established sites will not allow for the investments so finding good sites is hard part to invest. It looks like rollin has got good amount for traffic to their site to make a decent profits.