Maybe time to declare this isn't worth the trouble in life, and there are better things to spend effort on? What are you winning? Sell, and make a buck while you can. There isn't much principled fight to be gained here, is there?
It's the guy's name. He registered the domain 5 years before Nissan Motor Company showed interest. He seems to have started businesses further and further from "automobiles" so that he wouldn't have a trademark dispute with the car company.
> Their own actual business doesn't look that remarkable or even successful.
Is that the measure by which someone should keep their property?
The district court issued a final Judgment (PDF) allowing Nissan Computer to keep its nissan.com and nissan.net domain names, but restricted our rights to do the following: 1. Posting Commercial content at nissan.com and nissan.net; 2. Posting advertising or permitting advertising to be posted by third parties at nissan.com and nissan.net; 3. Posting disparaging remarks or negative commentary regarding Nissan Motor Co., Ltd. or Nissan North America, Inc. at nissan.com and nissan.net; 4. Placing, on nissan.com or nissan.net, links to other websites containing commercial content, including advertising; and 5. Placing, on nissan.com or nissan.net, links to other websites containing disparaging remarks or negative commentary regarding Nissan Motor Co., Ltd. or Nissan North America.