Agreed, any CTR over 1% or 2% is unlikely to be genuine.

However your table doesn't take into account the number of AdBit ad spaces that this is spread across. For moonbit.co.in there are 4 AdBit ad spaces so the average CTR per ad unit is more like 0.6% - you can see this by going to https://adbit.co/?a=Advertise and clicking the Show button to expand the ad spaces. The 4 spaces are currently getting a CTR of between 0.2% to 1.2% each.
This tends to vary day to day depending on the quality of the banner ads that are showing - if they are good (and relevant) then the CTR increases naturally of course.
I think it would be more useful if your table showed the average CTR per ad space - i.e. the total CTR divided by the number of ad spaces. Then it would be very clear which ones are not genuine - those that stay consistently above 2% is probably a good rule of thumb.

Another factor is the position of the ad spaces - moonbit.co.in has them in very prominent places (e.g. just below the faucet claim form etc) which will naturally lead to a higher CTR, and therefore better value for the advertiser. Some other faucets hide their ad spaces way off below the fold.
 
Finally, don't forget that AdBit shows UNIQUE views and clicks only - so these CTRs cannot be directly compared to what you might see elsewhere (e.g. AdSense). For faucets in particular, the true number of views is much higher than shown (moonbit.co.in gets over 250,000 non-unique views per day) but the clicks are probably not much different - resulting in a much lower true CTR.

Just my 2 cents