There is about 149 billion dollars of difference between the amount of money Google needs to "keep the lights on" and the 150 billion dollars that Google will s

There is about 149 billion dollars of difference between the amount of money Google needs to "keep the lights on" and the 150 billion dollars that Google will see in revenue this year. Also, if "ads keep the lights on" then why aren't there toll booths on all paved roads, since "tolls pave the roads"?