You are right, but I would like to think that it is more difficult to get on the "All-Stars" or "Unfinished Business" (same thing under a pseudonym) seasons on the Amazing Race than on Survivor. I know that I don't want to see such seasons any more often than once every 10 seasons. At this point 22 teams have had the privilege of being on those seasons twice. Which of these teams would I like to see a third time?
My favorite team Dustin and Kandice is on that list, but still I don't want to see any of those teams come back again. Each team has had 2 chances. It's time to give other teams a chance. The answer is that I don't want to see any teams in Amazing Races a 3rd time.
Three teams I would love to see get their chance for an All-Star season are Colin/Christie, Ken/Tina and Brook/Claire as they are probably the three strongest 2nd place teams who have not had that opportunity. Who knows which additional teams might emerge before the next All-Stars/Unfinished Business season occurs?