I don't know the exact figures, but VDG allegedly paid $8m cash up front at a time last year when Sauber would have been broke without. They ended up paying him $15m back (again, allegedly) so they are $7m down.
But, Nasr and Ericsson brought $40m (so they say), so say half that per driver, $20m, less the $7m loss on VDG, they are still $13m up on that one seat, or $5m more than they would have got by honouring VDGs deal.
Of course it could have been better, but its not that bad either.
Sutil and Guttierrez? Did they pay cash up front like VDG did? If so, then they will get a similar amount of compensation back. I don't think they did though, so their circumstances are totally different.
It is one thing to break a contract that neither side has honoured yet. It's a different situation when one party has fulfilled their side and the other then backs out. That's why there was a lawsuit and a big compensation cheque for Guido and his investors.