AdSense for Search is completely useless.
If you own a website and have ever considered putting a Google Search box on it, don’t. Recent experiences at my company have shown that it is all but useless. We average 30 million page views per day and that little search page, which is even nicely skinned to match the site, earns us around $3/day.
From the stats I can generate I would say our demographic is too tech savvy to randomly use the search built into our site. Rather, our users have a set way in which they conduct a search and they are sticking to it.
Really the best part of AdSense for Search is to monitor the top 25 queries that go through it using the Advanced Reports tab in AdSense. I won’t lie, ours are slightly disturbing and are a prime example of when not to listen to the masses when determining a brand focus.
AdSense for Search doesn’t hurt to have in place, but it takes up valuable real estate I believe can be put to better use.