It's basically providing incentive for more drivers to join Nissan (and do well too). I'm actually surprised that no other manufacturer has done anything similar to this, at least making a sort of shout out to the gamers to show their loyalty to their favourite manufacturer. Perhaps we'll more stuff like this during the rest of the 2018 season.
If they made the Gp.4 car a 370Z (or 350Z for that matter) to mix it up a bit, I'd be all over it. As it is, I don't think I've done a single Manufacturer race with Nissan, despite owning one.