This is meant as an innocent question, because I've never been in a prop shop nor do I know anyone who has. But, if a trader was consistently successful, making $200K+/yr, and his account was large enough to finance his trading with the margin offered by regular retail brokers, is there any financial reason for him to join or stay in a prop shop? Especially now with retail commissions coming down it's hard for me to understand why that trader would want to have to shower and drive to an office to trade. I'm sure there's camaraderie and idea sharing, etc., but I'm wondering if there are also financial considerations. It seems to me based on my minimal knowledge of prop firms that the people who join them are predominantly newbies who need training, equipment, and BP -- things that aren't necessary once a trader has reached a certain level of success. Do prop traders who eventually become successful eventually leave the firms to trade on their own?