It appears that you've had second thoughts. That can't be good.
Before you damage your Karma and turn out the lights, take a moment of reflection. Then, click the damn back button and finish what you started! You'll get stuff (whatever it was you were thinking of buying) and we get to pay our hosting bills. See, it's a win-win situation.
And if that's not enough to convince you perhaps this will: If you're buying a sponsorship or advertising banner you can cancel your subscription at any time.