No there isn't, I just created the Tribe so I can join alliances and have a more direct chat with some people .
No, cuz I joined in 443 to see if I already own the crap mini base over there and I was already with the re-created tribe. So as you can see, re-creating or staying without tribe its just the same, since I'm the same player/playerId or whatever they use to authenticate players/make them unique.