Zoron - 9:07 pm on Nov 8, 2010 (gmt 0)
It is all about CTR. Just write more ads to get better CTR.
It's not ALL about CTR. I've got a lot of historically double-digit CTR keywords with previous 7/10 and 10/10 QS that dropped as low as 3, 4 and 5...and I've been waiting for so-called return adjustments before I pause, delete or re-work them...and getting high CTRs in the meantime...but avg positions have dropped, CPCs have risen...and a tell-tale indication on one account...for many of the keywords the 'est first page bid' has risen from $.05 - $0.25 to well over $1.00 and in some cases over $5.00...ALL from very low QS which I would never under other circumstances keep active.
There's no question in my mind that they've altered the algo...'test' or not...ostensibly in the never ending pursuit to increase revenue returns.