Hi everyone!
Some time ago I asked a question about disappeared ads here. Google said that invalid traffic is likely to be the reason. That's why I investigated the users behavior on my website. And there's one thing that bothers me.

Google Analytics shows that I have a lot of clicks on certain pages from a direct visitors. I believe, this is not normal. In this example you can see that I have 100 clicks from direct visitors during the last 24 hours. (I wanted to add screenshots but don't know how to do it the better way)

Source/Medium = direct/(none)
Publishers Impressions = 1909
Clicks = 100
Publisher Revenue = $2.90

Another thing I see is that Google often counts clicks but doesn't pay me money. I can presume that all those clicks were from the same IP and Google algorithms decided that was invalid activity (fraud). Here is another example:

Publishers Impressions = 3
Clicks = 14
Publisher Revenue = <$0.01

I see that such weird behavior takes place on the same pages every day. I mean, there are certain pages where it happens far more often then on others.

I know that all this has been discussed millions of times, that users can click on an advertisement as many times as they want and this is out of our control, but could you please write your opinion behind this issue.

My questions:
1. May GA display visits from some other search engine (for instance, Chinese) as direct visits or these are REALLY direct visits with 100% probability?
2. Should I be concerned about it or just relax and let Google algorithms decide when to pay me money for clicks and when to cancel if considered as invalid?
3. What to do? Maybe I should disable ads on those web pages where I have such clicks because it can do more harm than profit...