I don't pay fines unless they are delivered to me by registered mail as per the Road Traffic Offences Act.
If I genuinely did something wrong and get fined for it, sure, I will go pay. I once got pulled over and then discovered to my dismay that I had left my license at home. That was my bad, I went and paid the fine. But otherwise I refuse.
http://aarto.co.za/ssm.asp tells me everything I need to know.
Of course, I've never received a speeding ticket or any other type of ticket except for that one license-less incident.