Okay I try to bite:

Say I'm a "novice" user who starts up the web browser. If everything else works, then here's what I'll see:

A screen with a textbox that says "Search: [ ]". This textbox is at my eye level - I'm likely to see this before the "address" bar on top - which in a lot of computers isn't even labeled anymore.

So delightfully enough I search for something like "facebook login". If the first result isn't something I'm looking for, then I might get angry.... in some cases, at the person who authored the first result .. "hey jackass, I came here looking for the facebook login - whats going on? stop advertising as something you're not!".

What can I say, I'm just a spoilt baby boomer, and you want my money.