Why would Google change itself to become simply a yellow pages? That's what Yahoo attempted (charging $$$ to be listed in their directory) and they failed miserably, completely losing their once dominent position.

On top of that - why should Google change this model when, in the second quarter of 2006, under their current system they earned $2,455,991,000 which after expenses left them with a cool
$721,077,000 in profit?

And that's just for three months.

Steve