Umm...why would they do that? I had the keyphrase in my ad AND in my landing page, and its directly on topic for my website. So, could this possible be a quality score issue? Something else?
Another (unrelated) oddity. I found a keyprhase which costs $5.00 per click before I can be active, though the average in this niche is about 10-15 cents! I typed in the phrase on Google and I see only 2 active ads for this key phrase. Again, my ad and my landing page are on topic and contain the keyphrase. So, again ..why would this be?!?!?
[google.com...]
It could perhaps be that this keyword or phrase is highly competitive - more so than the others. Maybe you could try a separate adgroup specifically targeted at this word or phrase. Make sure the landing page is directly relevant and is up and running.
I have heard of people having this situation when their server has been down when Google reviewed the page - they can't see the page to give you a QS therefore hike the price.
I am sure there are a whole host of things you could try. Feed back to us so we can help you more!
That is your answer, if you can't understand then maybe you need to do other things instead of trying to be a webmaster.
Unwarranted rant following a fair question.
Looking through the threads on this forum, it is clear that none of us (possibly excluding rbacal) are really clear on wht the quality score algorithm is really all about and how it works.
Yes - those who've been around this thread for a while will instantly recognise a $10 mininum as the QS algoritm at work - but that's hardly a sufficient answer is it.
Car_Guy's link will cover at least some of the background.
[edited by: Pengi at 3:48 pm (utc) on Oct. 22, 2006]
Quality score can also impact it, but for a 25% increase I would look at CTR first and do some multiple ad testing to see if you can't create some better ads that give you better CTR.