When you start out...you have no idea what you're doing. This is great. People who know what they're doing know the rules, and they know what is possible and what is impossible. You do not. And you should not. The rules on what is possible and impossible...were made by people who had not tested the bounds of the possible by going beyond them. And you can. If you don't know it's impossible, it's easier to do. And because nobody has done it before, they haven't made up rules to stop anyone doing that particular thing again.
Nothing I did where the only reason for doing it was for the money was ever worth it, except as bitter experience. Usually I didn't end up getting the money, either.
The world conspires to stop you from doing the thing that you do because you're successful. There was a day when I realized I had become someone who professionally replied to email, and who wrote as a hobby. I started answering fewer emails and found I was writing much more.
The things I've done that worked the best were the things I was least certain about, the stories where I was sure they would either work or more likely be the kind of embarrassing failures that people would gather together and discuss until the end of time…. Looking back at them, people explain why they were inevitable successes, and when I was doing them I had no idea. I still don't. And where would be the fun in doing something you knew was going to work?