I think it's just a ploy for the author of the 1982 book: Holy Blood, Holy Grail to get some free advertising. If it weren't for this suit, would anyone have ever heard of this book in the first place?
Like everyone else, I thought that E&E was very helpful for Civ Pro. I used Emmanuel's for Torts since it was keyed to my text and I thought I did fairly well in that class too. If I compare my grades in classes in which I used the commercial supplements and classes in which I did not, there was a significant difference. I personally think they are very helpful in understanding certain concepts when both the text and the professor are vague.