Ok, I’m not going to pretend I have all the answers here on the subject. As for myself I’ve avoided anything to do with rakebacks because I didn’t understand it and every time the subject or offers are presented it came with a lot of hype.
However, the truth is it’s not productive to offer rakebacks arbitrarily to all potential players. That’s because not all players deposit or play at stakes high enough to benefit from such offers. As Shark suggested work with those you have already. More importantly try to educate your players if you can. If they’re not going to benefit from a rakeback explain it to them and why. They may not agree with you at first but in time they may thankyou.