What about the annoyance factor? "Hey why are these strangers contacting me and asking me to send you messages to contact them?! Do I look like your personal secretary??"
It sounds easier than it looks, but that's how you get your money as a debt collector. The ones you can't find are probably just as like to be no shows in court. Once you have a greviance, it's easy to garnish. All that involves is contacting their employer.
In most cases, any amount under $10,000 is not going to be worth going to court over. You will pay lawyers that much just to get the case to trial.