The monthly bonus takes into account several criteria, such as your:
VIP rank.
Wagered amount in the last 30 days.
Profit values for the month and house edge of the games you're playing.
For example, if you have an unlucky month, you might receive a bit extra on top of the monthly bonus. Playing games with a higher house edge offer a higher monthly bonus percentage compared to games with a lower edge.
If you have any questions or need further clarification, please don't hesitate to reach out to our Customer Support Team. We're here to assist you 24/7.