londrum - 11:41 am on Jul 14, 2010 (gmt 0)
Overdoing the followup ads is just shooting yourself in the foot.
i dont think it affects the companies that much. if you dont click the ad, then they dont have to pay. so it doesn't cost them a penny. and they could argue that they are building up brand awareness for free. if it annoys the people who have no interest in the site, so what? they aren't going to be interested in the site anyway. so its a no-lose situation for them.
(although dont you get a quality score based on click through rate? im not an adwords user so i don't know, but maybe that would act as a disinsentive)