So you have tried. And never sold a single photo. Interesting. What site was that, ShutterStock? I submit to this site and after almost 2 years, I am finally getting some passive(yet small) income from it. But I guess it is mostly about effort and time actually, considering that 99% of my photos (I have over a thousand of them in my port) were taken with mobile phones (icnluding some ridiculous prehistoric pieces :D) But back then when I opened my SS account, I didn´t have much other work to do so I was just shooting, editing, uploading and keywording long hours every single day. You are much better and experienced photographer than me, maybe you should just give it another try ;)