It's crossed my mind that they're building up an endowment of sorts that will support their <ehem> work </ehem> more sustainably than just depending on publishers' contributions.
Imagine if they have a goal figure in mind and that once they've acquired those "billions" they can just sit back and rest assured that whatever the contributions or lack of them might be they'll have plenty of money to continue living ever so merrily in their Warwick compound.
Then I think, NOT. It seems to me the GoBo asking for money is one of those things that never cry out and say "Enough!" Bunch of filthy lucre loving hypocrites, the whole nasty bunch of'em with their mahogany offices, rolex and iWatch's and pinky rings!