The interest on culture debt is really high.
One of the few common characteristics of super-successful companies is that they have a distinct culture. Google. Facebook. Zapps. Netflix. The list goes on and one.
Maybe you can't create a culture -- but you can certainly destroy it through neglect. The 2nd Law of Thermodynamics applies here. Left alone, most things degrade to crap. In the early days, it's OK to rely on the behavior of the founders and early team to set the culture. That works great. The problem with this model is that as you start to grow, there's a fair amount lost in translation.
Text from the talk can be found here: