There was a recent article in this months Deer & Deer Hunting magazine which posed the question:
Is Scrape Hunting Worth It?
In this article they went over all the different types of scrpaes and when they are made and what they mean to other deer. The conclusion was:
Yes scrape hunting is worth it.

Hunt a scrape that is active. If you want to know for sure, take a stick and move a leaf or two onto the scrape and check it everyday. make sure to not contaminate the area with your scent. You can also get a mock scrape kit as well and make some of your own, forcing the buck to be more agressive on his scrape.