Since I only work with webmasters I can't really divulge any particular details, but years ago when I as at a different company, I had a guy who wanted to buy a bunch of content and demanded that it be the newest and best we had, that I give him a money back guarantee that his site would be 100% successful with it and that I sell it to him for half off. LOL!

I sell content, but I'm not a miracle worker. I told him "I can give you great stuff but what you do with it is up to you". Geeze.