It bothers me more that Brenchel were allowed back in than even those teams that are being given a third chance, because, so far as I know, those other teams haven't appeared on multiple reality shows. Even Brenchel's wedding ended up on an episode of David Tutera's My Fair Wedding.
I stopped reading the spoilers after the first couple of times results were given, just because I didn't want to know that much, but I'm overjoyed that the Twinnies didn't last. I also wish the Beards, James/Abba, and/or the Chippies had come back for another shot, but it's possible they were asked and weren't interested or couldn't take the time to do it. It is a fairly major time commitment and not everyone can take that kind of time off for a reality show, because they have other responsibilities.
Sometimes I wish they'd do a reunion show or a "where-are-they-now" show, so that we might find out what's happened to teams we enjoyed but who, for whatever reasons, have chosen not to race again. I've also thought a season comprised of teams that finished second would be interesting, if they could ever get enough of them to agree to it for the same season.