Is there any way to block IPs after let`s say 4 clicks from the same user?

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  Ranu Jain: Yes, there are ways to block. You can block their IP address(s) and can also block them by location. ;Neither are totally foolproof, but both can go a long way towards decreasing your competitor’s clicks.
  
  There no such rule or a pattern for conversion. You may have conversions in one click also. So I would suggest that don't block the users till the time you are not very sure that they are your competitors/ the spammers. If you don't analyze properly you may block the genuine users too.
  
  You can look at  ;the raw logs file. If you find so many repeated IPs then we can think of blocking them. ;
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  S?awomir Zdunek: +Ranu Jain ;It is a local business so I cannot block the users by location but only by their IPs. You are right that there is no pattern for conversions. There are too many factors which can play a role here. I suspect that quite a number of clicks come from the competitors and some part of the money for the AdWords campaigns is wasted. I think if somebody has visited the specific landing page 5 times or more and hasn't converted, it means that he isn't likely to covert after the next 5 visits. I was also wondering how it is possible to locate the competitiors who click the ads. I think it is more of a hit or miss game.
  
  I block the IPs of SEO agencies which click the ads to offer their own services. For me it is not fair. I never do it myself and I am against such practices.
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  Ian Dixon: What makes you think it is the same user just because the IP is the same +Sławomir Zdunek ;?
  Many households have multiple computers and multiple users that all connect to the web via a single router using the IP address allocated to the router. They are different users acting independently but they will show with the same IP address.
  Now apply the same thing to any public access internet such as a wi-fi hotspot or a public library. Once again, you find many different users with the same IP address.
  I'd say that the likelihood is that you are simply seeing clicks coming from several people in a single organisation that happen to see the ad.
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  S?awomir Zdunek: +Ian Dixon ;Of course I agree that there is such a possibility but knowing the overall profile of the website and the company in question and the services which it offers I would say that the probability is almost zero. Because of the profile of the website it is visited hundreds times every day and lots of users visit it many times. The problem is to locate the users who come to the website directly by AdWords and visit the same page many times in this way. I have also received from Google info about invalid clicks so I think it definitely confirms my speculations. ;