Not all derivative works are strictly bad, in the same sense that copyright infringement (eg, downloading an album on The Pirate Bay to try it out) can be a gateway to purchasing content (albums, concert tickets) a consumer wouldn't have otherwise.
Not all derivative works are strictly bad, in the same sense that copyright infringement (eg, downloading an album on The Pirate Bay to try it out) can be a gateway to purchasing content (albums, concert tickets) a consumer wouldn't have otherwise.