I maintain that your position is naive. While I am no fan of how copyright is used by various entities (MPAA, RIAA, etc) and the specifics of the legal implementation (duration, erosion of fair use, etc), I at least can recognize the value it actually creates.
Take the movie or music industries for example (since you already brought them up). The multi multi million dollar budget movies that are produced are only created because of the environment that exists due to copyright. Without those protections, theatres and stores could legally display or sell these titles without having to pay any money to the content creators. No store that paid any money to the creators could compete since their margins would be worse. The end result is that no large budget (or even small budget) titles would be created.
Now, before you say that free titles could / would be created to replace all of these, look at the facts. People can create free titles now and make them copyright free, but they tend not to. Further than that, the overwhelming titles that are downloaded (movie or music) are the ones produced under the copyright exists model. These titles would simply not exist in a copyright free society, and that is the value that copyright creates.
As for your comments concerning currency, it still is an artificial economic construct (which you do not seem to deny?). So I take it that you are backing away or at the very least refining your initial statement opposed to ALL artificial economic constructs (so you only oppose those which you personally believe to not have value)?
Lastly, concerning patents related to the medical field, I am not going to dig up your previous posts as you direct unless your arguments in favor of such are substantially better than the ones you have made here so far.