Not to sound like a hipster, but as I was watching this I felt like I'd seen this guy before. Turns out, Louis Theroux did a documentary on him about 7 years ago. There's not a huge amount more insight and the behaviour seemed a bit more muted at that point (although it could just be different editing and presentation styles).
One thing that he did was spend some more time with Tim Stark, the guy that has his own place and becomes a partner at the end. You get more of a sense of why everyone says he's so unlikeable, pretty unpleasant guy.