Your bonuses only gets bigger if you wager a higher amount of money, for people like me the bonus part is always not enough, because I prefer playing with low amount of money, it's even why bonuses don't look that interesting to me anymore after I found out that big players are the ones that benefits the most from bonuses.
Welcome bonuses, deposit bonuses, these two are what I care about, so yes bonus is a very attractive offers from online casinos, bonuses are very important.
This is the most common mistake by newbie gamblers who are interested to deposit bonus/welcome bonus than bonus for being active (VIP bonus). Deposit/welcome bonus comes with high wagering requirement and some other terms while VIP bonus comes with no wagering requirement. I have no idea how can people is more interested with welcome/deposit bonus than VIP bonus. We do not even need to have a lot of money in order to enjoy the benefits of VIP program. I'm small gambler whose average bet amount is under $0.5 but I can enjoy the benefits of VIP program in 2 different casinos (Duelbits and Stake).