Yes this has been going on for years. I have always thought that it gives an unfair advantage to advertisers using Checkout as the relatively large multi-colored ads draw attention to the ad over all of the others.
I'd love to seem some stats on this, but I would think that CTR would be higher with these then those without them, regardless of position on the page as visitors eyes are drawn to them.
limoshawn
4:18 pm on Jul 14, 2010 (gmt 0)
we have found that it actually lowers our CTR in much the same way that including a price in the ad does.
travelin cat
5:43 pm on Jul 14, 2010 (gmt 0)
limoshawn, that is interesting. Does Google give you the option of including the image, or is it just automatically included if you use Checkout?
limoshawn
6:04 pm on Jul 14, 2010 (gmt 0)
there's no way that i know of to manage it in the adwords interface. in the google checkout interface you link or unlink adwords accounts and that's what we use for an on/off switch.