In game payment is a difficult issue. The game has to generate income to survive and the income model used by RN has been tried and tested for many years (oh yes Ben Cousins, I remember your talks well).
Many people will pay small sums e.g to keep plus accounts active, and I would be surprised if this causes much concern. Things become more problematic when the pay advantage becomes so significant that "standard players" feel completely left behind, as is the case here.
In shooter games, skilled or experienced players have a chance of competing against the pay to play fraternity; but in a long term strategy game like this, skill and experience have limited impact against a super spender with a massive advantage.
Having the ability to build an era 6 station by the middle of era 2 (or sooner) is an outrageous advantage. There is an easy fix...RN could decide to nerf the cash benefits in the interests of fair(ish) play, but I guess this depends on the company's priorities.