Post-monthly only for platinum+ users whereas we only collected reload despite making wager more than $1000 in the last week

I think when you have reached your bet more than $1000 per week you should start to keep playing at sports betting because there is a statement that when you do sports betting you will get 3x faster points which can increase your VIP even more. Increase your bets and reach the VIP rank as fast as possible to get bonuses every month.
For big bankroll and high level bets this is true but same wagering can be done with dice 1.01x that costs nothing with 1% house edge. Generally it doesn't worth chasing level up on Vip rewards system, best method is to win and rest will follow winning streak. After Plat 2, I have stopped doing bets for wagering and level up on ranking.