maybe google needs to do this kind of thing to weight our pages.
imagine that google has got five sites about a similar subject, and they want to factor in user behviour, or something like that, to guage which is best.
that would be a lot more difficult to do if one site had 100,000 visits a day, whilst at the other end of the scale one only had 5,000 visits a day.
just because they get less traffic doesn't necessarily mean its a worse site.
so if google gives them all 36,000 visits a day and checks the stats again, all the sites are on an even keel, and they can better decide which is the best.