Folks, the Source Hunter DLC pack is just a means of getting some of the Digital Collector's Edition benefits for people who already owned the game on Steam (i.e. Steam Early Access backers). Steam doesn't allow people to purchase the same game for their own account twice, so this DLC pack was the only way for SEA backers to "upgrade" to the Digital Collector's Edition (which only became available at a later date).

It was something we requested and Larian was kind enough to oblige us. It's not them trying to push DLC on people on day one.