The Spanish novelist Javier Marías sees seven reasons not to bother and only one to give it a shot:
Writing novels allows the novelist to spend much of his time in a fictional world, which is really the only or at least the most bearable place to be. This means that he can live in the realm of what might have been and never was, and therefore in the land of what is still possible, of what will always be about to happen, what has not yet been dismissed as having happened already or because everyone knows it will never happen. The so-called realistic novelist, who, when he writes, remains firmly installed in the real world, has confused his role with that of the historian or journalist or documentary-maker. The real novelist does not reflect reality, but unreality, if we take that to mean not the unlikely or the fantastical, but simply what could have happened and did not, the very contrary of actual facts and events and incidents, the very contrary of “what is happening now.” What is “merely” possible continues to be possible, eternally possible in any age and any place, which is why we still read Don Quixote and Madame Bovary, whom one can live with for a while and believe in absolutely, rather than discounting them as impossible or passé or old hat. …
Earlier, I said that fiction is the most bearable of worlds, because it offers diversion and consolation to those who frequent it, as well as something else: in addition to providing us with a fictional present, it also offers us a possible future reality. And although this has nothing to do with personal immortality, it means that for every novelist there is the possibility— infinitesimal, but still a possibility— that what he is writing is both shaping and might even become the future he will never see.
The Dish 