I think there might be good reasons for it, but under limited circumstances. For example, if you want them to rid themselves of what they're holding, make it hard to retrieve, AND they're near a window, it would work pretty well.
In a circumstance where someone's actually holding something, I think reaching into a pocket or pouch to toss out 3 copper is probably abusing the adjudication of the spell. If drop makes them drop what they're holding, defenestrate should make them toss what they're holding out the window.
Either way, I'm on the side of it being open ended but using the listed options as guides for what's an appropriate level of effect.