If that's the only consideration then we should probably not stop at 30%. What about 80% or 90% instead?
I think 20% could still be plenty of incentive, especially when paired with the supercharged chests and just the prestige of playing at the highest levels.
Plus at some point tournaments will bring in outside cash and those highest players will be there to gain the glory and winnings.
Champion is never going to be the lifeblood of this game. I think we can reward the highest levels and still keep the game balanced.
Maybe my wording was too strong. I agree with what is proposed and wasn't saying there needs to be more for Champion than what is being proposed.