Up to $60 for a re-release of a fairly old game? With mildly better graphics, but somewhat aged gameplay? With an addon/expansion/side story/whatever that is even worse than the original game?
It's a FULL sequel. Dark Athena is about as long as Butcher Bay, with all new graphics, gameplay mechanics, story, voice acting and more.
It also includes a partially enhanced Butcher Bay, and multiplayer.
It is very much worth $50.
I don't get your misconception.