It does seem that people have highly varying results with Adsense for Search, some report very little activity and others seem to get very high activity. I thought it would be the opposite of this, I just presumed a search box is a search box and it would get the odd user no matter what the site. Once again implementation is the key!
Remember that Adsense for Search did not share Competitive Ad Filter with Adsense for Content. I just figure that out why my search click paid so low