My original comment was just off the top of my head, so I don't hvae any particularly good reasons, but I do have some hypothetical ones - again, off the top of

My original comment was just off the top of my head, so I don't hvae any particularly good reasons, but I do have some hypothetical ones - again, off the top of my head: - Because they're aliens, with different modes of thought! (But that's not very satisfying.) - Maybe they're long-lived enough and live slowly enough to consider stars more of a hazard than a useful resource to live next to - those things go nova, put out lots of dangerous radiation and flares, many of them turn into gas giants and incinerate any nearby planets, and they attract others to the neighborhood. Maybe it's better to live a quiet, hard-to-detect life, slowly cruising through galactic space. - Maybe that's the environment they originally evolved in, and living near a star would be as alien and uncomfortable for them as living on a gas giant slowly floating through space would be for us.