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Of course this is kind of reductive and silly but I see the analogy as taking Ethereum as Money (abstracted labour power), there are those who have to put said labour power into the system, and those who don't. This too: "But the ruling class now feels that’s too much because it amounts to a lot of value for the work. So the ruling class changes the rule of 5 Eth per block to 4 Eth per block.", mirrors the contradiction of wages and surplus value in the capitalist mode of production. The thing is regardless of the form of abstracted labour power, those who hold large sums of a commodity are free to buy lots and make an easy turnover in the market world, resulting in easy power in most societies as well.