This is one reason I like Netflix. It keeps track of every movie you've watches and which you've rated. It makes me less likely to switch should another competi

This is one reason I like Netflix. It keeps track of every movie you've watches and which you've rated. It makes me less likely to switch should another competitor come along. If my supermarket gave me access to all the junk I'd ever bought from them I'd have much less of a reason to shop around--the data is much too useful to abandon once you've built up enough if it.