I make money by pushing bits around; specifically, I write and maintain software for my company. The company has a general idea of what value I create, and pays me based on that. Sometimes I do better than they plan on and sometimes worse. It's a pretty sweet deal, but it doesn't transfer well to artistic endeavors.
Suppose I were able to write publishable-quality fiction. Suppose I then wanted to write a novel on speculation. How am I supposed to make money on it? I've written it, so under a no-copyright regime I can either sit on it, which does nobody any good, or release it freely, in which case I get no money for my work. Suppose I want to write another novel, despite not getting paid for the first. I have to go around fundraising as well as writing. People have to decide that they're willing to give me money, despite me not having much of a track record. And, of course, if I raise enough money (conditional on releasing the novel, I assume), that's an absolute upper limit on what I can make. It seems to me that I can put a heck of a lot of work in on fiction before I can start getting significant money from it.
In the current world, with copyright, I can write on spec, and if I can talk somebody into publishing it I can get financial rewards from it. They may not be much, but they can continue. I can strike it rich if I write something that really catches on. In the meantime, readers can decide if they want to pay me for my novel on a case-by-case basis. They don't have to commit to paying me sight unseen. If they come along and decide they like my work, they can reward me for the stuff I've already published. Under which regime can we expect more good fiction?
The difference is that your software is relatively easy to agree on a price for. You agree to provide good-quality software that does something specific. This is worth a good sum of money to somebody who pays you. Fine. A novel is not written for a particular need (aside from series and romance novels), and there is usually no one person who values the novel so highly as to pay what the author needs for a decent living. If some organization would guarantee a base amount of money for an original novel, there's be at least some reward for writing one, and we'd be paying endless amounts of money for crap.
And don't give me the line about how people will create because it's fun. Creating something is fun. Making it into a polished and entertaining product involves a lot of drudge work that nobody's going to do without being paid for it. Without copyright, people would still play the guitar and sing and tell stories, but that's where it stops.