The thing is clear, Shelby. All profitable business will lead to centralization, cartells, unequal wealth distribution. All written up in that older thread.
There is a difference between "unequal wealth distribution" and "centralization". Centralization happens, when decisions of change, permissions of participation etc.. can be taken by a small set of colluding entities (in other words, by one single meta-entity), changing former engagements, even with respect to one single participant.
In other words, when it becomes possible to vote, and to obtain a majority for change. When one can vote, and one can hope to obtain a majority (that is, all positive voters are colluding), you have a centralized system. Even if they consist of one million different voters, they have become a single colluding entity capable of change against the agreements made with a minority, even with respect to one single participant.
Of course, the smaller the number of votees needed to do this, the higher the probability of de facto centralization. And if one single votee is possible, you have a truly centralized system.
Whether these votes need to obtain 10%, 50%, 90% of whatever "stake" (nodes, real-life persons, stake, hash rate, quantity of prime numbers, amount of Mc Donnalds hamburgers eaten in the past or whatever) is allowing change doesn't matter. What matters is whether such collusion can be reached or not.
The only way to actually change a decentralized system, is if ALL participants agree with it. Decentralization is the way to impose "respect of contract". The only fair way to change an existing contract, is if ALL parties signing the contract agree upon changing it. "majority change of contract" is not done, it is ripping off the minority in disagreement.
And now, the question is: how can you obtain a "majority vote" in a truly decentralized system (centralizing it, in other words) ?
By bribing voters. How can you bribe them ? With rewards. If a majority can vote relatively MORE REWARDS for themselves, the decentralized system becomes centralized, the minority is screwed and the contract is broken.
This is why one cannot have "rewards" in a truly decentralized system in its basic functioning (the system can be used to give rewards to people, but not by its intrinsic functioning) ; and why one cannot have voting systems or "governance".
Centralization is bad, not because of "inequality", but because of "breach of contract". Of unilateral contract modification, majority (of whatever weight) over minority (the screwed ones).