Some think birthday bonus is fixed bonus, and some based on waggering or activity but having maximum amount (depends on the rank). We don't know.

Have you tried to subscribe the emails back in "Stake" site. They still sending me some junk promotion stuff and other, I already over 7 weeks right now without waggering, deposit or activity. Could be your subscribe emails is getitng unscribde ? but, we all know you already moving on from here. I also expecting how much birthday bonus for my rank ~LOL without deposit a couple month soon.