I'd just like to point out that John Cage made a piece of music that is exactly 4m 33s of silence.

And there's probably other, similar examples.

I see nothing wrong with it. I didn't look into Salvatore Garau's arguments, but those of John Cage are interesting and thought provoking, and valid.

If my city bought something like this for a million bucks I might be cross with my city - but not the artist. If they manage to sell that for 18.000 credits, well, good for them. I'm sure the buyer wasn't duped into anything and knew exactly what he was getting.