I am new here but have a question about online casino bonuses and why they exist. I noticed that pretty much all online casinos, poker rooms and other gaming services being offered online give players an incentive to play via these bonuses that are offered. My question is really why do online casinos offer these kinds of bonuses to begin with?

In my opinion it creates unnecessary competition among the online casinos and other gaming service providers. If you look at casinos with a physical presence around the globe it's not likely that you'll see that they offer you a $100 to come and play at their casino (although they do offer rewards for you play via internal comps that usually come in the form of free breakfasts, rooms, etc...).

thanks in advance for any advice!

I guess they would want the players to get interested with all the things that the online casino has to offer. For example, they would want to have a good thing in stored for everybody, that's why they are giving in bonuses so that people would register to them. In that way, you would be able to really get things work out, as well as having a lot of choices and to get playing online a little bit interesting.
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City Club Casino

They offer bonuses to attract new customers. An those bonuses often have rules, so that you have to deposit more money to get them later out, smthing like that. But it is easy to manage and attracts customers, "free" money is always in good.

Yeap attract new customers and beat other sites offers, afterall many players are only interested in the deposit bonus and rakeback system. They need to give more to get more