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Are you sure is not being sent by wagering?
I think pre-monthly still need wagering, but the only different things the reward is being fixed by the rank of your account. I miss something or what, maybe some information about the topic you are referring would be help.
What I know, mostly need waggering ~XD
If I'm not wrong pre-monthly requires wagering, and based on that will be the bonus amount. If there is no wagering, then the user will get a minimal amount fixed for the level same as that is being followed on monthly bonus. Wagering is needed to receive high bonus amount.
That's right.
During the livestream for the megarace this past weekend the owner mentioned how this worked out and it is the base amount then anything on top of that is the amount wagered for the week.
This also pertains to the monthly bonus as well.