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The_Grizzler - 12:51 am on Jun 30, 2004 (gmt 0)
If you set your budget considerably higher than you expect to spend you will find that it doesn't cost you a lot more in the long run as your ad will show more often. This should enable you to acheive a better CTR in any case. The other factor that definitely is a must is to have had your ad approved. If your ad has not been approved you will not get a strip ad across the top.
CTR is only a factor when your budget borderlines on being insufficient.