This sounds good in practice, but most web infrastructures don't pay per page-load. It's possible to do this to some extent, but typically, a number of servers

This sounds good in practice, but most web infrastructures don't pay per page-load. It's possible to do this to some extent, but typically, a number of servers sit un-utilized, but paid for nonetheless. Also, Google displays their own ads in these results, so it's not like visitors who may go to a site with ads are somehow relieved of this annoyance by using Google.