Its called 'Recent Play Bonus', you get it each time you level up (Silver, Gold, Platinum, Jade etc.). This bonus is based on any losses you may have incurred in that previous level (when you reach Gold, we'll run your stats while you were Silver and give you a bonus based on that).
I thought these bonus is not a lossback.
I don't know recent gameplay bonus is the same or not with "Stake". I always though, these bonus is not taken based on loss but based on history recent of our gameplay maybe deposit, how much waggering we are made for the bet, or waggering is being made.
We can get big recent gameplay based on those scenario (not sure how these calculation, either in here or stake). But... I always though like that.