not sure what you're asking. you want to know what the average CTR is of ALL adwords advertisers? even if that number were published, most likely it would have no significance. for search, focus on trying to find the "sweet spot" that will keep your CPAs at a reasonable level, while still maintaining your ROI. with that said, having a CTR below 1% is worth trying to raise since your QS will probably be pretty low. on the other hand, if your CTR is super high (like 5% or more) and it's not converting high as well, then you're wasting money. at that point, you'll want to try to lower your CTR (words like "free" etc will most likely increase your CTR instantly)
I agree with mysteree, that information is irrelevant. What IS relevant might be the average CTR of what YOU are looking to advertise. Also, that Average would shift from month to month too. And would depend on current news and trends. makes sense right? Probably the only way to get an average CTR from a certain niche is to track the competitors daily over a period of time and average them out. That information can be obtained with a free browser add-on. see my sig below.
I have some keywords which produce between 7% and 14% CTR it depends on the competiveness of your search word/phrase The less competitive the higher the CTR so 20 clicks with 200 impressions will yeild 10% 3 to 5 % is average But most importantly look at your CPC which of course when compared with profits will give you a viability. After all if you get a CTR of .05% but you get a sale from 10 clicks and you pay $10 per click its fine if you are making enough profit to cover a cost of sale of $100
What is a good CTR for the Google Content Network? I am assuming, hopefully correctly, that the larger CTRs you guys have been mentioning relate to the Search Network. Please correct me if I'm wrong.