Just a random thought: Your civilization figured out how to travel FTL, or very close to speed of light. You are also advanced enough to easily avoid obstacles such as asteroid collisions, high radiation etc. Where would you go to search for other intelligent species from outskirt of the galaxy where you evolved? I think going to downtown (to the center of the galaxy) makes the perfect sense. Suns are closer, other species come to this place to study about the galaxy. So, basically this is the perfect place to meet other civilizations. Unlike searching in the boonies (what we are doing at the moment).