I think we have discussed about it before, and AHOY had shown that he received something like $75+ for pre/post monthly bonus IIRC.
Other example is coming from myself, I used to get max $35 only no matter how much I lose and wager but there were few time when I received more than $50 after the change.
But as usual, every formula for bonuses at Stake will always remain a mystery and we will never know the exact formula how they count bonuses.
Ah ok at least we have another reference regarding this one, for @AHOYBRAUSE it might be understandable since his wager is $100k or more every month and you also said your wager is around $50k or more per month it's kind of over the wager target so you get extra bonus, me and most other users did not exceed the target so we got a fixed bonus. Yeah it's a bit hard to understand how they apply the formula to the bonuses while we can only guess. What is clear is that this information will be a reference in future discussions.