I used that trick last year, and had some interest in it.....from year and a half olds and younger.....I also don't think the scrape brought them in.

I set up in travel corridors, and use the scrape as a point of interest......In other words, I use the scrape as the distracting agent I need to kill the deer. Buck walks to scrape. Buck buries nose in scrape. Buck gets arrow through the lungs....

That's the PLAN, anyway..............