[Onkel Neal]

I found them: starts here
http://www.shacknews.com/extras/2006/072606_ritual_piracy_1.x

Refers to this dev's blog:
http://www.romsteady.net/blog/2006/07/games-hidden-cost-of-piracy.html

More here:
http://www.romsteady.net/blog/2006/05/piracy-sin-ep-not-work-safe.html

You can imagine how dispiriting it is for a game developer to realize that only 1 in 5 of the people playing his game are honest enough to buy it. I'm not claiming 5:1 is a standard ratio, just that is reported in this case.

cheers,
Neal