It is a fairly common complaint with reality shows when they go on to the second or third season.

The first batch of contestants seem to be there for the game, for the experience, for the whatever the goal of the show is. Once people see that you can get famous there can be issues with the second or third (or later) batch coming off as being there to get fame, which generally is not something that people like to watch as much. Sometimes the producers do not seem to get that authentic real people make good television. Yes you do need some drama in any show and conflict and all that to make a good story, but casting very different real people who are there for the goal of the show creates that all by itself most of the time. You do not need to cast DAW wannabes who only will be there for getting screen time to get drama and conflict. Real drama vs drama for drama's sake is always more compelling for me.

There was a lot of concern around here when "The Biggest Loser" went to the second season. Many who liked the first season as the people there really were there to change were concerned that season two would be all DAW's trying to get noticed. Luckily it seems the casting people for that show still managed to find people who wanted to lose weight and change their lives.

Sometime a show grows past that problem with better casting, but sometimes even a long running show will seem to want to do the "stunt casting" for drama sake or cast people that are there for fame reasons. There was one running of "The Amazing Race" that got bashed around here for casting way too many wannabe actors and models. This season I think they did pretty good getting a nice mix of real people. I think they learned that while some eye candy is nice on the race, all eye candy all the time just annoys people who like the race part of the show about a race.

So anyway, in conclusion, this is a common problem for reality tv in general and not something that only happened here. You would think that over time the overall tendancy would be to learn from the mistakes of others, but it seems that every show has to go through this issue.