Good point from Robert Scoble:

[...] Here’s a test. Visit a Best Buy store. Now imagine that store without ANY human beings inside. What do you have? A bankrupt store.

So why when I visit BestBuy.com [their website] don’t I see any people? Hear any conversations? Is there any wonder why Amazon has a P/E ratio much higher than Best Buy? (Amazon puts real people on its Web site — it’s ironic that an Internet focused company “gets” the value of people and their conversations better than a “brick and mortar” store does since without people a brick and mortar store would simply not exist). [...]

Excellent argument.