We have two types of gambling one is skill games and another one is casino games. the skill gamblers winning percentage is higher than casino gamblers. And the slot games casino will make a huge profit because they have control of there games. But the sportsbook will depend on the game result. So according to me the slot games casinos will earn huge money to compare sportsbooks. Finally the casinos are always in profit side.
For earnings stats for both casinos and sportsbooks, I think they are just the same. We just realized that casino games can give more money to the owner since it's pure based luck and the games here are having fast results.
But if we look at the inside stuff of those sportsbooks, we don't have an access to their databases of bets so we can't say that they are far away from generating money for the owners compare to casinos. There are also lots of losses in sportsbooks especially with those high odds that is worth to bet ranging from @5 above which I think have a maximum average of bet around BTC1 based on my observation. And that is only a single game so how about if we will include on the others. And final point, they will not run continously if they found sportsbooking only giving an earnings that is not that much.