Yes, but if your margins are good and your growth is strong enough, you can remove yourself from the equation and hire people to takeover most of these tasks. You'll probably still have to attend the board meethings though.
Then again, it's probably not considered a startup anymore at that point.
Read "The E-Myth" by Michael Gerber. It points out how most businesses must be setup from the start to allow a systemizatiom/franchising that allows the founder to exit.
Then again, it's probably not considered a startup anymore at that point.