Obviously I know everything about bonuses and so on, I am a long time customer there. And you should know, there are no more base amounts. They got rid of this over a year ago. When they had base amount you can get like 50$ for 4k wager when platinum 4 (my experience), now you get like 13-18$ if you are lucky.
Also, I don't expect 18x the monthly for 18x the wager, you should know that.
But 90$ for 20k wager and 220$ for 380k wager is just not a fair calculation in my opinion.
Anyway, will be gone soon and start fresh somewhere else to collect level up bonuses. Diamond level up is just an impossible task I think. It took me 4 years to get to where I am now, would take another 4 years to repeat that wager and reach diamond.
More precisely the base bonus is reduced by around 50% initially the monthly bonus for platinum 1 was $50 but now it is only $25 by collecting 2-4 tickets as you said
I have no idea about bonus calculation but you knew this for years even you often complain about it, I'm not here to defend but if you find something better please let me know I will be happy to try it. I have accounts at almost all crypto casinos but I haven't found anything more interesting regarding bonuses yeah i'm here talking about small gamblers like me not whales like you or other players. If I may guess you will stay here for the next few years I mean as a stake player.
I believe it is more than 50%, if I remember it correctly I have never received less than $25 when I was Platinum 1-4 no matter how much I wager during the month.
The latest monthly I got ($20 Plat V) make me sure that there is no longer base amount, although my wagering activity is so low compared to previous months, but I still wagered more than $15k in the past 30 days before the monthly bonus.
My overall profit is still positive before the monthly bonus, but $20 monthly bonus for Plat V looks so low if I compared to what I have received 2-4 years ago when I was in lower rank.
Surprisingly, the latest weekly bonus was a bit bigger than my monthly bonus
I received $22 last weekly bonus FYI while I wagered less than $2k without deposit.
I'm not complaining, just sharing my experience and I also aware that it is Stake's own right to change anything in thier bonus system but as player, I hope to see what they had 2-4 years ago back
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. The $100K pool to be won within 24 hours makes big gamblers excited to hunt for a place. 
