I wasn't thinking a class action lawsuit. I was thinking more David vs Goliath. David i.e. Troy, has a legitimate and legal business of selling replicas. He follows the rules as required by eBay which were thrust upon them by Porsche and yet Goliath i.e. Porsche, comes along and squashes his legal right to sell a product. Or sue eBay for interfering in your right to sell a lawful product in a lawful way.
eBay sells thousands, if not tens of thousands, of counterfeit items everyday and does nothing or very little to stop it. I have reported dozens of counterfeit items and have made dozens of reports regarding ads that were obvious scams. I've reported ads offering real Patek Philippe watches for pennies on the dollar which are obvious fakes and the watches sell without the ad ever being taken off their site.
This sounds like collusion to me so sue both eBay and Porsche for interfering in your right to do business selling replicas.