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Let me have some input from here.
Bonuses has various types. And I highly believe that the OP is not looking for faucets (which is most of the time, completely free). The OP is asking about casino that has good % bonuses, and lower RTP (he mentioned it).
Somehow, these bonuses (rakeback, daily, monthly rewards, etc.) are really helpful as you can make something happen from it. I had few experience in which I turned some bucks I got from my monthly into a $1k.
Different bonuses are always available depending on the kind of gambling rewards we are looking for. I don't always depend on rewards I will get from casinos because there is always rule attached to it which means you can only use the fund to win certain amount of money and if it exceed it the profits will be cut short.
I have a friend that used a bonus he was given when he registers on a gambling platform and gamble with it many more than 10× with the bonus. He was later deprived of the profits because the platform has limit amount one can use the fund to make extra profit. I became dumfounded because I still don't get why such rule will be imposed.