> Its also useful as a data point in larger statistical analysis of an "audience" (i.e. a group of people with certain attributes) to marketing organizations. E

> Its also useful as a data point in larger statistical analysis of an "audience" (i.e. a group of people with certain attributes) to marketing organizations. Every datum that they get makes their models somewhat more accurate. Which is extremely valuable. Without them, a company can see they sell 1,000 units of product X and 500 units of product A. With these data models of individual buying behavior, they can see that 400 of the 500 buyers of product A also bought product X. So they can start marketing product A to product X buyers to boost product A, instead of just trying to market it to everyone and hoping for the best.