Don't read books much anyway. Never have. But I will occasionally in order to follow a certain character or story. 

I actually find it a bit helpful too as you can see how other people write and get ideas for structuring your story. For instance I read BB Murder case again (Death Note Novel) and found it interesting how the narrator starts off telling the story from his perspective at the beginning of the chapter before switching to the standard novel perspective. It's a move that flows really well and gave me a few ideas.

I believe the big difference is that story telling will always be fixed with plot twists and a certain outcome. Roleplaying will always have a lively atmosphere and can change through the players input.