How can I earn legit residual income. MLM and network marketing have failed!?

I have joined, succeed temporarily and looked at a lot of Multi Level companies and they all fail unless I work my #@$ off! Many people say sell vitamins, insutrance etc... but there are so many vitamins and stuff of better quality and cheaper in health food stores and competitors around. And this goes for many other products... being More expensive with Network marketing companies. So.... I am looking for a way to make residual income so I can work one time and get paid over and over again. Any ideas?