Hi, I am newish in the adsense program, while I have been concentrate on building traffic, it has showed some result. but my earning has dropped significately, mainly because the pay per click went down. I have heard of sandbox, and I am not sure whether am in that situation or not. Your help on how to increase the pay rate is greatly appreciated!
Err. No? CTR is the click through rate, that's impressions / clicks. Google can't smart price that, lower CPC, however, might indicate that you've been smart priced. Then again it might indicated that there just isn't as much competition for the keyword you target anymore.