Better safe than sorry. Seriously. One day I earned 10x more than usual. I got really happy thinking it was a big success, but then at night I got an email and my account was banned. So hopefully you're not getting click attacked.
why you need to report if you have not clicked or any suspicious activity is found from same ips. Only higher CTR raises no issue.
It depends. How many actual searches did your visitors generate for you to get such a whopping high CTR %? The numbers are easily skewed. For instance, if only 5 searches were made, and two clicks generated, that's nearly 50%. A lot, yes, but considering you only had 5 searches, the numbers are horribly skewed. If you're getting 100s/1000s of searches and your CTR is 88% -- yeah, you have something to be worried about.
if its just a few searches then there is nothing to worry about...I have two searches and two clicks today for 100%