Well I am guilty of “taking the leap”. I did leave my job last year to pursue my interest. But before leaving the job I tried for quite sometime to get started with my ideas side-by-side. Only after few unproductive months I realized that I will never be able to put up anything worthwhile unless I work on it full time. And it has kind of paid off in my case.
I would say it is very debatable what one needs to do to chase his interest and make a living out of it. Different people act differently to uncertainty and that is what one should keep in mind to decide to take that leap or not.