Agreed. I do have a general concern over what can be perceived as fairness, but it’s not the “rich gets richer” issue: it’s a factor of fundamental differentiation.
If I only want to make money, I’ll take my SOL to the highest bidder. The reason I have mSOL is the promise to make Solana more decentralized through an unbiased, algorithmic distribution.
I’d be very careful with the perception around the stake percentage that gets controlled by voting, merely because if at any point it creates the impression that Marinade is no longer impartial, it will lose value in people’s minds.
Yes, we can explain why it hasn’t happened, provide evidence in terms of costs and effects, but if you have to explain yourself then chances are you have already lost.
Indeed. But if this is anyone’s concern, the flip side is that someone that well-funded and well-connected likely doesn’t need to bother with suborning or subverting Marinade. They can probably find other easier ways to grow their stash. 
Happy to give this a shot with a non-controlling percentage, like the suggested 10%, then slowly take it from there.