A lot of people things the shots are mostly affected 30-60 yards, but the biggest differences is close shots. Just a quick calcuation, shows if you are 24ft in a tree, and a deer is 10 yards from the tree stand, he is 6 yards from the tree base, you should have used 6 yard pin. But at 20 yards from the treestand, you should have used 18.3 yards pin because the deer is 18.3 yards from the base. At 30 yards, 28.91 yards. 50 yards, same as 49.3yards.
so your exactly right.