Even if the casino spends a lot of money on the promotion, they can get a return from the gamblers who lose their money so that is worth doing that.
The gamblers' bonus can invite more players to come, especially if the casino announces here as this forum has many members who often play gambling.
But it needs more responsibility from the players to prevent losing much money as if they follow all of the promotion, that will need much money to spend because we do not know when we can win the games.
Big casinos have advantages to run long and big promotion. Because their budget for promotion are from profit. They reuse profit to run promotion and with successful promotion, they attract more gamblers and get more income, more profit. So from profit, they earn more new profit and can prolong their promotion whenever they want.The gamblers' bonus can invite more players to come, especially if the casino announces here as this forum has many members who often play gambling.
But it needs more responsibility from the players to prevent losing much money as if they follow all of the promotion, that will need much money to spend because we do not know when we can win the games.
Small casinos don't have such advantages and they only allocate small budget to run short term promotion that does not bring good success and big effects. Then they don't attract too many new gamblers, not much new income, less or without profit from promotion. Consequently, they end promotion with failure.
the thing is, even big casinos sometimes start small
so making ads and having a good marketing team plays a role for them to grow regardless of their size
they can grow in terms of getting a bigger slice of market share, or by expanding the market too
how much cash did you get guys?
. Guess the prizes they give out are more random than we think. Would also like to know if you could save your freespins, would be fun to like save up 100 spins and than spin it all. 
