Bonuses are so attractive for the players of casino. If bonuses will not be so popular different casinos would not offer them so often and will not allow to players to use them when they are playing.
I think that for casinos is very important to have a big choice of diferent slots. But bonuses important too.
Now there is a big choice of different casinos and everybody can choose what he wants.
I think that it is very good that there is a big choice of different casinos for gamers to play. To survive casinos must constantly developing and offer games, slots and bonuses that are offer the better conditions for their users.