The Volkswagen brand has seemingly been squeamish about their licencing (search for "war toys"). There are no Volkswagen's in Need For Speed for instance, which involves breaking traffic laws and running from cops and generally doing illegal activities. The other brands that Volkswagen owns however have no issues like Lamborghini, Audi and Bugatti. Porsche is also owned by Volkswagen but they are more picky with their licencing, not because they are squeamish like Volkswagen, but because they think the Porsche brand is super valuable and as such they don't licence it out to just anyone. There are only two licences for Porsche in videogames for instance. One is held by EA who make Need for Speed and Real Racing the other is a more restrictive licence held by Microsoft who makes Forza Motorsport and Forza Horizon. The more restrictive licence means Microsoft has to sell the Porsche cars in a separate expansion pack, normally $20+. I could see Porsche requiring TT to charge a higher price for CJ or Jazz than a regular MP.