What creators decide to charge is less the issue than is what the audience is willing to pay. And there's the rub.

Also, I think looking at things on the basis of "pay x for y amount of time" is flawed. It's not just the length of time a piece entertains… it's the quality of the entertainment, the expectation and anticipation of the audience, the track record of the creator and, yes, the medium of the entertainment. For most people, if the medium is the Internet, the acceptable price they're willing to pay goes down.

What to do about that? I don't know yet.