Maybe I should clarify a bit better. You can post/comment as much as you want daily, but your personal posts should only be eligible for rewards on the first 4 posts each day. 4 is an arbitrary number that I borrowed from @papa-pepper which he took from the old steemit white paper, so it used to exist.

Interacting with others is just as important as doing your own posts, once again I think there is no need at all to post more than 4 times a day, or at least limiting potential rewards to the first 4 posts. since the reward pool is limited each day, why should someone who posts 10 times a day with limited or useless information be able to take much more of the reward pool than someone who creates one thoughtful post per day?