>>36No, it is not. Commissions have thus far barely managed to cover my hosting bill.
Profitable novel-writing is a mixture of fan service and luck with a heavy emphasis on the young adult genre. To wit, older people don't have time to read and those that do have a very diverse range of interests whereas teenagers have all the time in the world and have yet to form interests.
If you consider the more recent success in fiction, this becomes readily apparent: Harry Potter, Twilight, and the Hunger Games are all targeted at young audiences. The one adult-oriented novel that comes to mind, 50 Shades of Grey, is Twitter fan-fic and capitalizes on its now older fans who are looking for the literary equivalent of pornography.
Genre writing can become profitable
after establishing an audience. Mystery, Fantasy, and Sci-fi writers can eventually develop a healthy following. A Game of Thrones is a perfect example of this, but bear in mind the first book was published in 1996 and Martin already had 3 Hugo awards under his belt for various short stories and television scripts. It wasn't until 1999 that he made the New York Times bestseller list with A Clash of Kings and only really took off in 2011 (pic related).
So if you want to make money, write for teenage girls. Otherwise, write whatever the hell you want and hope people recognize as art some time before you die.