You do have to take risks, especially in a "business" like football.
But let's look at Hiddink's recent coaching jobs: incredibly well paid gigs, at clubs/federations who were willing to pay him insane amounts of money. I'd assume that in these previous cases, certain clauses (such as consequences in case objectives were not met) may not have been included, due to the very nature of these jobs.
So, maybe the board was willing to pay the 7 million a season (or whatever it may have been), but maybe they weren't willing to do it without some kind of emergency exit in case things didn't work out as expected. And the inclusion of such an emergency way out could very well put off a coach like Hiddink who has remarkably little to prove right now anyway.
Of course, these are all just assumptions on my part, but those were my exact thoughts when Hiddink was first mentioned: he won't do it, instead he'll go to a club or NT (big or small, doesn't matter) where they'll throw a lot of money his way, almost unconditionally. Can't blame him for that either.