@achim03 I had done some research on this over a year ago and found similar results. Yes the $13 threshhold does work.
Secondly I would like to add this to your research. It may be cumbersome for a person to check the source code everytime.
So with chrome browser I use extensions like no follow and Automatic backlink checker.
Hope this helps
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Hi @thetimetravelerz,
Thanks a lot for your feed-back. This could indeed make the research much easier :-)