Counterpoint, I've been on this site for over a decade now and am not a good programmer. But yes, I guess effort, experience, talent, and luck are the best cocktail for a really good programmer.
Not everybody on this site would make a good programmer but if I picked a random person here I would have better results than if I picked a random person from the rest of the population. Choosing to spend personal time somewhere like here indicates a few personality traits.