The formats are different, both are for generating leads, Brad is more obvious, from what I saw he will pass you onto his Leads team very quickly. 2 different people 2 different styles.
I think Jim realises that many people are there for the entertainment. I think there was one a few weeks back which started the show and lasted 20 minutes? maybe more, now worth it from an entertainment perspective but not good from a leads/keeping the people waiting to get on happy.