"Why the high usage of Google's Chrome?"
A better question: how are these stats being compiled? I literally don't know anyone who uses Chrome, at work or at home. I'm not even sure of the last time I saw a computer running it. Could it be that the numbers are coming from collated page browser checks, and Chrome is rating highly simply because it talks to everyone who asks while other browsers obfuscate?
(Serious question, by the way, this isn't just a Chrome bashing session.)