I'm not seeing the benefit from behavioral advertising. I should be an easy person to target -- I buy techy stuff that fits into pretty neat categories. Yet A

I'm not seeing the benefit from behavioral advertising. I should be an easy person to target -- I buy techy stuff that fits into pretty neat categories. Yet Amazon seems to be completely unable to figure out some very simple patterns, like that if you're not a company, you're probably not looking to start a collection of printers, cell phones, UPSes or monitors, and that buying one is a sign of that you're done with the product category for a while.