Hi,
How do you really proof your stake in ETH? Do people with more ETHs have a huge unfair advantage?
They have invested money into buying these coins, just like miners are investing into hardware. Would you say that a miner with more fiat to buy hardware has an unfair advantage over the others? From one point of view yes, but so do all the rich businessmen in the world. If you open a bakery and another baker has an uncle with millions of $, he'll be able to buy more ads, build a bigger facility, hire people to threaten you and force you out of business or buy you out, that's how the world works.