I understand the basics of marketing, but asking a customer for their zip code isn't going to tell you much about them personally. It's the reverse engineering

I understand the basics of marketing, but asking a customer for their zip code isn't going to tell you much about them personally. It's the reverse engineering that is the real key and problem with this strategy. I'm pretty sure that when any internet user with half a brain goes to a website they know they're giving up info of some sort, what page they came from, IP addy, etc. My only point is that you don't expect that same level of privacy invasion (if you will) when you go buy some headphones from Best Buy.