From Arathnorn:
"Income is an extremely deliberately vague abstraction of Doof's 'spending money'. It is the money that he is able to siphon away from the operations of his megacorp for the purposes of his wacky schemes, odd fancies, mercenary contracts, and strange obsessions. It is quite deliberately never going to have a clear explanation on an exact dollar amount, because like hell are we bookkeeping that.
"Many tasks have a lower income amount than you would expect if you were measuring it in pure dollars- it being possible to buy a single sandwich for a significant fraction of a corporation, for example, and the reason for this is that Income only represents Doof's spending money, extraneous to the company. More 'down to earth', profitable, or sane actions are likely to cost less than one might expect, as it is justifiable to partially expend the Income of DEI itself in the process of acquiring something, that, you know, you could justify in a board meeting.
"This is also why Hostile Takeovers of major megacorps do not have an Income cost at all. The money necessary to buy out a megacorp is so astronomical that Doof's Income meter is functionally meaningless, and only the full brunt of DEI itself can possibly succeed.
"Running out of Income means Doof has to ask anyone he's personally bankrolling to skip payment until he can get his funding in order- leading to a variety of potential stat and opinion penalties."