People with more money always earn more money. They can earn more by selling their votes. They can earn more by posting for the sake of posting and 'promoting' their own content by voting for it, and they can even earn more by doing nothing at all and collecting vesting rewards. Finally they can earn more by exiting (selling) Steem altogether and putting their money to work somewhere else.

People with more money making more isn't a reason to do something or not to do anything (other than perhaps if advocating for an explicitly redistributionist mechanism). It is almost always an appeal to an emotional argument (jealousy, us-against-them class divisions, etc.). The better analysis to look at structural incentives both ways, and which way results in a better/healthier ecosystem.