Why? So they can have a 'score' that's on par with other nations?
Isn't it entirely possible that the actual aid physically deliverable in the short term has been maximized?
That is, that the Dutch might be better off waiting and raising/sending targeted expertise and funds during the inevitable, but not starting any time soon, reconstruction phase? (Where much of their expertise is something that very few other nations could even offer)
I suppose it wouldn't hurt to pledge that they'll do that now, but any amounts tied to unspecified quantities of work would be fiction anyway. So the number would only be moved for the sake of making it move.