In my area, it is useless to start one in hopes of attracting bucks to come to your spot more frequently.
I have tried using all different scents and set up camera's on them. even if
a buck reacts to it it does not hold his interest long enough to keep coming back.
Mock scrapes are best made when you find a real one, (Fresh) and better to be a primary scrape..
and then you make yours next to his. put whatever buck lure you want in it. then hunt it for the next few days.

also whenever I hunt a make a fake scrape and sometimes a rub in a visible spotwhere I want to make my shot.so when a deer does come walking by and sees it the likely hood of them coming over to ck it out and give me a shot. It works you don't even need scent (sometimes i Forget to bring it with me) it works on their curiosity.