Well, I would say that it is not just reading, but writing as well, as more you write, better writer you become.
The worst part of being dyslexic is, that one doesn't often understand when he or she has done a mistake or an error. This means that one can read his work, everything plays well, but there is a mistake in the sentence/paragraph that one misses, without ever seeing the mistake. Ever to understand that error is making the story too difficult for the audience to understand.
You can overcome dyslexia, but it requires that you are ten times more careful on how write, whatever you write. It might require that you rewrite your story ten times before it is good enough for the submitting. Even then it might still need a bit of editing.
However, I agree on above comments, that one has to read to gain the knowledge, and to develop the sense for understanding what is good storytelling and what is not. This comes via reading and watching on how others have done their stories. If everything clicks, then one day you have developed a critics skill, an inner-voice that tells you what is what, and why someone written the story in a way it has been written. At the end, if you are lucky, you have developed a style and an ability to churn out those best-selling stories ... and gain immortality for thy name.
If one - hypothetically speaking - hasn't done their studying via reading, then one has developed their story-telling skills by doing something else. This being telling a bed-time stories, creating a horror-stories for the camp fire sessions, or even by creating adventures for the role-playing games.
Nevertheless, it is the talent that separates one from the masses - the great from the good. Because no matter how good you are, you can never be as good as the talented ones. They have the edge. You see that same thing working in all parts of life. Not everyone can be a truly great writer, a multi-winning athletic, or even a high-rolling gambler. Although, a hint of luck, can help you here and there.
Note that there is a catch in the best-selling stories. You see, the publicity helps a great deal in that game. More people know your name, better chances you have on making that best-seller. The good example is the sad story of Philip K. Dick, no matter how talented he was, he just didn't make his name, therefore he remained poor and relatively unknown to the end of his life. In which point, like in many artists lives, his art (stories) became extraordinarily famous.