Three paragraphs are several orders of magnitude too few for a serious treatment of the economics of these things. Italian restaurants have vastly different economics than, say, search engines or auction sites or bug trackers, or, for that matter, furniture makers.<p>It depends on the market you're in, its reach (Italian restaurants do not compete with other restaurants 1000's of kilometers away; craigslist does), network externalities and their strength in the market (they were right to say bug trackers don't have really strong network effects), switching costs and so on and so forth.