It is in a website's best interest to show you suggestions for other products you might like to buy, just in case you didn't know about them. It's like highly personalised advertising. But if you only ever see recommendations, suggestions and ads that are specifically targeted to your current situation, you will not long for anything more. The phone company might be able to sell you apps for your current mobile phone, but they won't be able to sell you a better one unless they suggest it. So it's in their best interest for the personalisation to be slightly flawed. Even if you've just bought a new phone, chances are you will see ads for their latest models anyway.
Mokalus of Borg
PS - Advertising is a tricky game like that.
PPS - Not that I've ever had to advertise anything.