They are now, but were they at the start? I remember a PG essay where the google guys were held up as an example of how even those developers with amazing potential can still be hesitant at the beginning, unsure of whether they want to or even can run a company.
"There's nothing wrong with being unsure. If you're a hacker thinking about starting a startup and hesitating before taking the leap, you're part of a grand tradition. Larry and Sergey seem to have felt the same before they started Google, and so did Jerry and Filo before they started Yahoo. In fact, I'd guess the most successful startups are the ones started by uncertain hackers rather than gung-ho business guys."
They initially tried to sell the company for < $1M because it was "taking time away from their graduate studies". It was only because nobody would buy that they became a multi-billion-$ company.
“There are some people who just get what they want in the world. If you want to start a startup you have to be one of those people. You can’t be passive and wishy-washy.”
Does wishy-washy mean something other than unsure?
<edit>
I think this is the quote I remember...:
from http://paulgraham.com/notnot.html
"There's nothing wrong with being unsure. If you're a hacker thinking about starting a startup and hesitating before taking the leap, you're part of a grand tradition. Larry and Sergey seem to have felt the same before they started Google, and so did Jerry and Filo before they started Yahoo. In fact, I'd guess the most successful startups are the ones started by uncertain hackers rather than gung-ho business guys."