**Some philosophers have been great writers** --in fact, most of the existentialists are.  Sartre and Camus produced some fantastic literature (*No Exit*, *The Plague*) and Kierkegaard's library of fictionalized alter-egos have inspired [quite a library](http://popculturephilosopher.com/kierkegaards-narrative/) of books and movies.  Plato was also a superb writer, and Chuang-Tzu is a fantastic storyteller. Meanwhile, the list of great writers who have infused philosophical concerns into their work is nearly endless (Dostoevsky, Hugo, Heinlein, Delany, Hurston, Shelley, to name just a few).  So there's nothing intrinsically stopping a philosopher from writing well.