> The cost of not being visible where customers are actually looking for you is very high indeed.

Does it constitute a monopoly though? I doubt the folks at Google love Amazon.com but if this became the sufficient to declare Amazon.com a monopoly, then the obvious next step is to immediately declare Google web search a monopoly. With over sixty percent of the eye balls (the last time I read any stats), Google would be in the cross hairs.

I doubt that would be good for anyone.