Do you check the stove 3,4 times when leaving the house?
Are you sometimes anxious, that you didn't properly shut the door after haveng left the house?
I have this theory where people who do these things are good programmers, since they will check their commit a lot of times until it is perfect to push. But maybe this is more about mastery than having an aptitude for it. :)
Twitter has a large following of powerful/smart people who don't leave over night. Sure, over time these people could leave, but why would they? What would a twitter competitor offer that twitter can't offer?