> I would disagree with your second point though. If you take a look at the search query data you will see that over 80% of the searches come from where users have typed less than 2 words in length. Only a small number of impressions are coming from searches that are 5 words or more in length so even if you had 1 million 5+ word keywords you would never be able to get the same number of impressions as you would with 2 word keywords if that makes sense.

No, it doesn't make sense.

10k 2-word keywords: 1M impressions/day

10k 5-word keywords: 100k impressions/days

If I now increase the number of 5-word keywords to 100k, what do you expect will happen? I expect to get abobut 1M impressions/day