Lets start with a welcome bonus. For me this is a perk, because they such bonuses are easy to obtain as they dont have killing wagering requirements. Their goal is to attract customers, not to take their money from the start. I am that fool that believe that any casino bonus is a perk I see to reasons for that. They are not necessary to take, and humans can get themselves into troubles/losing money even without a bonus Remove those bonuses and all what we get will be people stop migrating from one casino to another, but continue losing money, gamble greedy and reckless.