Google is not like the current wave of VC web apps: it was built on an idea that couldn't exist without the proper technology. For most VCs, that technology is merely "the internet," and their ideas simply leverage web connectivity to get up and running so they can see how they do in the marketplace. If a stronger technological backbone is needed later, they can always hire computer science grads.
For example, Facebook didn't need computer scientists to start out, but it needed them to grow. For VCs looking to make a buck, the business idea comes first, and innovation in technology can follow if it needs to.