Ok, I have more questions than solutions really, my thoughts about this are quite simple as math has never been my strongest point to be honest:

1. How does exactly this encourage to raise to higher tiers?, you would have a fixed pool that I'm guessing it's always higher in the top right?. But, would be profitable for guilds winning 50% of the matches?, instead of those winning 80% in a lower tier?, also, if I'm not wrong this would nullify the utility of the current Arena, as now has influence in the amount of crowns that are in play in a certain group?. Or it's added up on top of the arena bonuses?.

2. I Like the option of a formula with a logarithmic grow, Kalkulus's suggestion seem also quite nice, maybe this would be fairer but I'm guessing that we could extrapolate this examples to a current brawls to see their results that would have with these formulas.

Because for not math nerds as me it's quite difficult to see how this would play out, and I'm guessing that there is people not commenting just because it's hard to understand for them.

So an example extrapolating this to one real brawl could convince people to vote a potential proposal.