I'll tell you what these types of threads do. It makes the scumbag who's considering his next move consider if he really wants a couple dozen (or couple hundred) questionably-crazy people out there with an eye out for them.
If I had stuck someone for some $$ and I saw posts on a web board from other people asking where I lived since they were close and "willing to pay me a visit", I might think twice about getting those refunds out.
I'm not suggesting anyone take action on their own and would strongly advise against it. It's not really worth paying the price for what might happen just to recover a few bucks. At the same time, that possibility resting in the back of someone's mind can be a motivator.
It got Big Scotty moving.