If you're looking for an cheaper way to do the same thing, just run out there in the middle of the night when the neighbors aren't around and pee all over the place.

Wolf urine works well, but pretty much any predator's urine works (and humans are meat eating predators).

I'll guarantee that it doesn't come from a couple of wankers with guns.

Lol, ok, you got me there. It IS a little weird, but there could be a story behind it. I try to look at it from all points of view. I'd feel creepy doing that, but not if there was a story behind it (friend in PETA, for instance).