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Re:Justin Kan Launches Exec (YC W12) For Real-Time Mobile Jobs by staunch on Wednesday February 29, 2012 @07:16PM (#3650376)
Because neither has proven that it can work yet.

I can think of multiple counter-examples as well. People who are trying to run multiple organizations and doing rather poorly (as judged by results). I wouldn't want to single them out publicly though. Besides, it's rather difficult to judge the cause and effect for things like this.

Re:Justin Kan Launches Exec (YC W12) For Real-Time Mobile Jobs by justin on Wednesday February 29, 2012 @08:53PM (#3650618)
I agree that it is hard to focus on multiple things. Certainly I am not "running" Justin.tv/TwitchTV by any means: my cofounder Emmett Shear is in every sense of it. I don't think I could have a day to day operational role at two companies. At JTV/TTV I focus on providing value by advising those people who are in operational roles.