petehall - 1:25 pm on Jul 30, 2010 (gmt 0)
My guess is that it is more likely they are monitoring click-through rate, but that is just a guess...
Perhaps, but my theory is a bounce ratio is a more accurate guide for whether or not a site is relevant / quality for a particular search phrase.
If a large % of users click back the chances are the site is garbage or not as useful as other sites listed.
If you think about it click through rates aren't going to change that much really.
Titles may affect rates but I'd expect them to remain fairly constant with no1,2,3 getting x click through's per month regardless of the actual site that's listed in those positions.