Leosghost - 7:25 pm on Sep 4, 2012 (gmt 0) [edited by: Leosghost at 7:30 pm (utc) on Sep 4, 2012]
It's not blind luck, but a careful, informed projection of the odds.
That they will eventually click, certainly, but the site that they are visiting, when they click on an IBA, has nothing to do with the calculation..
IBAs are good for G, bad for individual publishers, unless their site could not efficiently be used to trigger normal / usual adsense due to lack of adwords ( due to adwords TOS restrictions or other factors ) on the site / page ..subject..
[edited by: Leosghost at 7:30 pm (utc) on Sep 4, 2012]