as i see it there is alot of money fed into the system but very little outflow, this is additionally compunded by the exploitation of bugs which add extreme amount of credits. I think this needs to be looked into as the inflation rate of the economy is beyond the capabilities of 99% of Rubi-Kans to meet.
One suggestion i have for remedy is to start adding cost based on level of the useage of grid terminals and whoompas.
Secondly have purchaseable items that add to stats, such as hunting licences that "tax" the owner a certain amount of money while they still own / carry it.
Thirdly allow the extremely rich to invest in monuments or public works projects which they finance directly to the council/government (you) for upkeep and to have their name in lights