You should post no more than 4 posts for a 24 hour period of time, otherwise you get penalized more and more for each additional post you make - less rewards for you.
This rule is hardwired in the sense, that your actual payout gets taxed.
The other 'rules' are interpretations of the algorithms and you can and should break them if you see fit - I agree
I'm refering to "rules" in a broader term :)