With every wager the casino will make benefit from you even if you win and for each loss they have the full amount.
Correct, Casino has a continuous profit through the house edge of the game. They deduct specific percentage on every bet win or lose. Simply, they profit more when your bet lose and they have less lose when your bet won. In the long run, casino will always win no matter what happened because the odds will always in favor with them.
we sign up on any casino and what are their promotional strategies so it's beneficial for them to get incentives.
If you think about it, Deposit bonus requires high wagering requirements which force user to bet longer to claim the bonus. We all know that gambling longer will make complete disadvantage for players due to the house edge. These bonuses is just a trap.