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If you are getting traffic and it's a good name, I would develop it. I did some research here on job scripts, which is probably the quickest and easiest way to go. If it doesn't have any traffic, then it's a waste of time parking.
You can experiment. try changing the NameServers to all four, i.e., nameserver1 to TrafficZ
nameserver2 Fabulous
nameserver3 Parked
nameserver4 NameDrive
Do that for at least a month, and you should get your answer.