The Bonus ARX for the higher tier purchases, Why not just remove the Bonus label and say 26,800 total ARX or 100,000 total ARX?
Is the Bonus label an attempt to tickle the part of the human brain that thinks £19.99 is a better deal than £20.00? Its an obvious carrot on a stick.
Im sure players of ED will buy as many ARX as they feel they need based upon the items that they have ear marked for their ships in game.
The bonus nonsense allows them to give us more Sex on special occasions without changing the base price.