There has to be a stability between the gambler and the casino when the gambler has to be more active to get the bonus and the casino gives the gambler something to be more active.
So that a good stability is formed between the two and of course it will go well and gamblers will also feel at home in the casino.
Actually gamblers expect bonuses from gambling, which is good.
Because some gamblers naturally want bonuses so they won't be in vain active in gambling.
The truth is, we all have individual points of interest and in some cases, we may defer in beliefs and aspirations, while a lot of gamblers may want constant bonuses from the casino, some others may only want to get the best they can with their deposits since it wager requirements before withdrawals are not same.