When reading some writers' descriptions of the writing process, one does have to wonder why anyone would do it for pleasure.
'Composition is, for the most part, an effort of slow diligence and steady perseverance, to which the mind is dragged by necessity or resolution, and from which the attention is every moment starting to more delightful amusements.' Johnson again.
Winston Churchill, among all his other achievements, found time to be a prolific writer. Not being a blockhead, and having expensive tastes, he certainly did it for money.
'Writing a book is an adventure. To begin with, it is a toy and an amusement; then it becomes a mistress, and then it becomes a master, and then a tyrant. The last phase is that just as you are about to be reconciled to your servitude, you kill the monster, and fling him out to the public.'