Every month the New Jersey Gaming Commission publishes charts for individual casino holds for all games. I couldn't find Nevada broken down this far. No distinction between vp and slots. Anyhow it is remarkable how consistent these holds are from casino to casino month after month. From pennies up to hundred dollar. I just don't accept that the formidable vp machines, mixed in these numbers could be that consistent without some type of programming. With highly negative games of vp in most casinos and novice players you would expect the casino hold to be much higher.
Check out July 2012 /Resorts Casino/ $100 slot hold.
http://www.nj.gov/oag/ge/mgrtaxreturns.html