You put the effort in and nobody says anything. Here's why:
Your decorations are competing with the whole street.
Pumpkin on the step, cobwebs on the railing, a skeleton somewhere. So has the house next door, and the one after that. By the fourth door of the night nobody's looking up any more — they're looking down, at where they're putting their feet.
The threshold is the only spot with their full attention.
There's a half-second where someone stops, steps up, and waits. It's the one moment on your entire property where a guest is standing still and paying attention to the ground. Almost nobody uses it, which is exactly why it lands.
Halloween decorations are money you spend once and bin.
Latex props crack. Cheap cobweb goes grey. Inflatables leak. You spend forty, fifty dollars every October on things that don't survive the loft, and next year you start again from nothing.
Most "spooky" mats are cheap plastic sheets.
Thin, papery, sliding around underfoot, curling at the corners by the second week. They look nothing like the photo and you can't leave one down as an actual mat — which is the whole point of a mat.
It isn't that your decorations aren't scary enough.
It's that everyone's looking at the ground, and there's nothing there.