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adsense earnings dwarf other avenues by anywhere from 50-90%.
Depends on the site, the audience, and how AdSense is used. For an established site with a high-quality audience of sufficient size, display ads or affiliate links can generate considerably more revenue than AdSense does.
But I suppose it depends on your site. For some sites ads can actually ad a form of validation that the site is established. In a weird way, some folks expect to see ads on big brand sites, and the better looking the ads, the better perception of the site folks get.
Service oriented websites should preferably not have ads as they provide an easy exit point.
What's your revenue model if you don't have advertising? Are you charging for your content? Or selling products yourself? What's the compelling reason for trying to keep users on your Web site? (And how long can you keep them on your site in any case, if the site has only five pages?)
And how long can you keep them on your site in any case, if the site has only five pages?
As I mentioned, a website that provides a service, say web designing or writing need not have 100+ pages to present their services. And in that case, ads should preferably not be included as the main aim of such sites is to sell their services to the prospective clients.