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For a long time now, my most popular keywords (related to my niche) that have been on the 1st page in Google, have been receiving terrible click through rates (close to 0%), while impressions are in the thousands (per month/keyword).
This has happened to me on 3 different hosts, 4 different servers.
After spending more time on this, I believe there is a problem with my DNS.
I also have secondary DNS for backup. Ten days ago, they (my 2ndary DNS service) experienced a full-blown DDOS attack on their system. During the attack, I noticed "normal" traffic (e.g. equal traffic to all my product keywords) and even an order. When the attack was over, everything went back to how it was.