Well, that way it would be technically possible of course.
But the whole idea behind steem is that the "best" content (evaluated by the whole community) gets the most rewards. The pool is limited, everything someone assigns to himself or his friends or family isn't available for anybody else. The fine could be put in the pool again, but that would give those who have the highest rewards the biggest part of it again.
Seems overly complicated and counterproductive to the goal of the platform. To rank posts by quality, it needs to be possible to take off rewards which then get assigned to everything else.
Thank you.