At some point between startup and market domination, there's a wild and wooly ride coming for successful SaaS companies. Once you get past David Skok's "cash flow trough," that scary place before your company reaches break-even territory, it's time to put the peddle to the metal. Why? Because rapid growth is the name of the game. You must capture market share quickly or die trying, bearing in mind you must also continuously reduce customer acquisition costs, reduce churn and maximize customer lifetime value. Whew! Yeah, a lot of companies die trying, but some flourish. My favorite example? HubSpot.