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What would be a ballpark CTR to expect when using Google's Adwords and/or Premium Sponsored listings? I'm sure the figure would depend on a number of variables including keyword term relevance, ad text and target audience so I'm really just looking for a ROUGH estimate.
There are, as quoted above, many variables that become factors. Often, that may be an integration within another engine, simple copy of your ad, or even the domain name displayed within the Adwords box itself.
Target properly, negative keywords, exact phrase matching etc... Make sure you understand what these all do before you start to make adverts and choose keywords.