The appeal of philosophy is akin to the appeal of dance. Both pursuits dare grown-ups to play, unashamedly. A philosopher will entertain any question that lends itself to a grammatically coherent formulation. He will obsess over questions of little or no practical significance.
Novelists write for the same reason some pray. A novelist wishes to believe that a narrative holds a lesson, and that one's lifetime efforts will eventually pay off. A novelist creates an illusion of his own when the illusions of others he finds wanting.
Literature moulds the past. Science drafts the future. Dance affirms the present.