thats funny I don't know why anyone would waste their money on themYou should get Lee and Tiffany's 3D SignPost. Very difficult to read and easily mistaken with underground utility markers. Plus I'm sure that they are only $499.99!!! And I'll bet they are available in scent lok too!
I absolutely think signs make a difference. And if/when you catch someone out there- they have no excuse. Put "Motion Camera Monitored" on the sign- put in the part where you can write something. I have that on my signs and I actually monitor the heck out of it with cameras to back it up (so I'm not even bluffing). I absolutely would post it, monitor it and you will get message across and reduce problems. No question in my mind it works and that's what I'd do BUT that's my opinion.