well, 2 reasons:
1) when Common Sense was released, i didn't like the devs put development in the paid feature because i thought (and still think) it's a basic feature which should be accessible for everyone (now, i don't want to start another dlc comment wars, this is just how i feel/felt and i have all the dlc for the 1.11, aside CoP)
Funnily enough, the Devs agree.