The suspensions are an automatic function of law, Snowman, and they are advised of such by the Judge and, presumably, by their attorney, if they have one. (More often than not in Family Court, they don't). In any event, most of these guys are barely paying attention, fidgiting and looking at their watches like a kid called upon to answer a question in school. So it's no wonder they don't hear what the Judge tells them.

It's not that they "don't have a clue" they owe the money; they simply don't give a shit. The suspensions are designed to remedy this by making it dificult for them to get to work or otherwise live thier lives. I've seen it in action: They start paying right away after that.