Darrell most likely doesn't care any more due to his "big scores". Even Jarrod and Brandi seem to have come full circle now with a second store and having some success.
I was referring to the plummeting ratings, when I brought up the new cast members earlier. That seemed like a half-hearted attempt to salvage something and create new rivalries and storylines. Darrell and Rene appear to not like each other in real life and have some kind of beef with each other from the way they tweet back and forth. I noticed as well that they had Darrell "feud" a bit with Ivy Calvin earlier in the season, and of course we had that convoluted little dispute between him and Brandon which was probably one of the lamest things the show has done.
Say what you will about Dave...but since he left, there just hasn't been that same dynamic. I think Barry got bored of things.