You might also want to consider using promille (per 1000) or something similar, when dealing with such tiny percentages. (I don't mean they're tiny for a CTR figure, just that small numbers like that are harder to get a gist of than "1.37 clicks for each 1000 views".
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This also bothered me. Just reading through his blog post makes it clear that proper English isn't very high on his list of priorities.
Whoops, my bad, it's been fixed with the % sign.
You might also want to consider using promille (per 1000) or something similar, when dealing with such tiny percentages. (I don't mean they're tiny for a CTR figure, just that small numbers like that are harder to get a gist of than "1.37 clicks for each 1000 views".