We had one out in front of our camera last year. Not a single picture did we get.

Having said that, I've used a mock scrape as a hunting tool w/ some success. I don't, however, use it as an attractant, merely as a distraction. If I'm set up in a travel corridor, I sometimes put out a mock scrape just to hold the buck's attention just where I want him so I can shoot him. I've had several bucks with their noses buried in them, just none I was going to shoot.