Think of yourself as a player.
What do you hate?
Depositing and losing
Now that is pretty poor for retention rates.
What would bring you back after losing your deposit?
A rakeback style of bonus. You lose your initial bonus but get an email with your cashback bonus at the end of the week.
Im not a fan of the 1million% bonus. It may get you in the door but it wont keep you. Not good for the site, not good for the affiliate.