Originally posted by Coaster individual
A different arguement that follows along the same lines would be that the cast members try to outdue the previous season, so they made a concious decision to act the way they do and take everything to extremes.
I think this is the problem with most of these shows. People go into it with an idea of the "character" they want to be seen as, then do stuff to make that happen. The show can be pretty funny though, just because of how over the top the people are.