For the most part I am not interested in paying for fanworks with the exception of when the funds are going to a cause I think needs it.
As for original fiction? I would and have paid for the original works of fanfic writers that I love. To me it's a natural and much more comfortable progression.

On a sidenote about fan artists I would not and have not ever paid for a piece of fanart that was selling for the sole purpose of the artist making a buck. I have no idea why but I have always found that practice a little skeevy.