Welcome to WebmasterWorld Guest from 188.8.131.52
If I go full screen (F11) then I will see 6. But for me, this is a PITA because I prefer not to use this option. I do not use it whilst I browse, and I won't keep altering it just for this. Google forgot the five "P's"
But they'll never do that, for the same reason they won't let publishers set a minimum bid for ad space - because then they're left with a bunch of cheap ad inventory that they can't place. And that would piss off the advertisers.