We keep repeating to all our friends, family and clients that internet security at their premises is not difficult to get compromised. Few people argue they have best firewalls and best wi-fi settings, but we persist to make them understand.
Recently I came across this interesting article that says "Google knows nearly every 'Wi-Fi' password in the world". Even WPA2 encryption or long random passwords offer no protection and easy to break. And with current news of NSA, CIA and FBI are tracking everybody's data, you will never know if your Wi-Fi passwords are already known to many others than just you. Go read this article to know more.