Thanks for the link.
About the economic argument (which is the heart of the matter):
If you want to obtain additional protection against large scale exploitation,
use a Share-Alike license.
This applies doubly to governments and educational or scientific
institutions: content which is of high cultural
or educational value should be made available under conditions which will
ensure its widespread use.
It seems that it's really a matter of context. I mean we're not talking about
free software here,
or content of high cultural or educational value.
As an author (let's stick with the online comics example),
It's clearly unthinkable. It's personal work.
I really don't see how in that specific context it is unethical.
Allowing others to make profit from my work as-is or slightly modified is
unethical though.
