One of the major reasons for Copyright is that it is a lot more risky and difficult to create something then it is to copy it.
If someone could just copy what you did and sell it for less, becuase they don't have to include the cost of creating it, then you just wouldn't create.
I personally don't think there's any evidence to suggest that nobody would create, or that the rate of creation overall would be lower, if there was no guarantee of return on creation. If nothing else, people always forget about the
personal rate of return of creation: some people just like to create.
That's also forgetting the main reason some people create things: this is because the things make it easier to do other tasks - in this case you shouldn't care if someone else can make the tool cheaper than yourself, because the high value isn't in creating the tool but in the activity for which the tool is used. All of history bears this out.
Now, this is slightly different when it comes to art, because art doesn't really help perform other tasks, but I don't think that means art needs entirely different arguments.
Really. Can you elaborate on this? Because what it seems to me that you are saying is that people should make things for other peoples entertainment. Because. They should? People should actively work to entertain you because your entertainment is that important, certainly more important then the people who produce it.
No, what I'm saying is that if you create something, and it's created in a way such that someone else can duplicate it, you arguably should not be able prevent someone from
expending their own resources to duplicate it. I would say you could prevent them from saying the replicated item is made by you, but that's it. Think of it this way: what is more valuable, the idea of a hammer when you need one, or actually having a hammer when you need one?
Consider this: if I personally had the skill and I was able to paint something that looked essentially identical to a Monet or Picasso or whatever, it would still be worthless because it's not the
image that has value, but the fact a particular instance of the image was created by the
original author.