I started in time-sharing and networking with packet switching, which was the precursor to what became the Internet. Time-shared use on packet-switch networks, when you think about it, is the cloud.
You've got to figure out how you're going to come in and significantly impact and redefine a market such that you become a market share leader in it.
You need to understand the market, know how you can differentiate yourself in it, and grasp the price and the functional differentiation competitive points that are going to allow you to be disruptive.
I am instinctively a network infrastructure plumber.
The more evident it is that a certain company is going to become the market leader in a big market space, then the higher the valuation goes because the risk has been dramatically reduced.