Totally agree, now I'm in my second month of Premium too. I'm pretty sure Khal and the boys are working on an auto-renew button or at least on a button that will appear for example 48 hours in advance that you can smash to add 30 days more of premium :-)
About usefulness, well, definitely my first month paid the second and in the second after I created a good longform post I think it is pretty much paid as well so I definitely recommend everybody to sign in!