This conversation need not go much further, but we'll just say there isn't nearly the problem with tweakers stealing metal and parts from my Dad's equipment yard anymore. Some people just need to understand the error of their ways. They'll tell their friends too.
Scrap prices aren't anywhere near what they were a few years ago. If they go back up, thiefs will be back at it.
I can assure you that isn't why they had a change of heart...