The Wayback Machine - https://web.archive.org/all/20060314203129/http://www.useit.com/alertbox/frequentbrowser.html

Frequent-Browser Programs

(Sidebar to Jakob Nielsen's column on loyalty on the Internet, August 1, 1997)

Big computers make it trivially easy to keep track of how often any given user has visited your website and to calculate that user's "frequent-browser points" the way airlines track customers' frequent-flyer miles. I envision three main classes of frequent-browser awards:

Just as with airline loyalty programs, I expect that "frequent-browser points" might be earned in additional ways beyond sheer numbers of pageviews. For example, it is an obvious idea to award points to people buying products from your site and to people who try out a new service at an affiliated site ("follow this link and get 50 points").

Update 2005

Amazon.com has implemented the idea of frequent-user rewards for its A9 search engine: if you search enough on A9, you get 1.57% off your purchases on Amazon.com.

I personally spend about $2,000 on Amazon per year, so this discount would in effect pay me $31 annually to use A9 instead of my preferred search engine. I probably execute about 10 searches per day, so the $31 correspond to slightly less than one cent per search, which is much less than the immense profits search engines make on pay-per-click ads. The payments thus make sense for Amazon.

Since A9 has just as good search results as any other search engine, why don't I use it and cash in my $31? Because A9 is slower than my preferred search engine. Wasting several seconds ten times per day adds up to much more than $31 per year for a highly paid business professional.