It did, in fact, used to be the Spawn instead of Lonely Cave. In fact, we didn't have Lonely cave, South Pole, Ascension Island, Sky's Rim, Atlantis, or Last Cave. It became popular for those random people, groups/species, and TLK role players. Since the last update, which introduced the new maps, people continued to stick to Bonfire. Even the newer members end up there for various reasons. Mostly, from what I see, is people like to usher new players to Bonfire. Bonfire is probably the easiest place to make friends as well. So people just end up hanging there.