Cars are spreed out in performance to allow level 40 drivers to lose.
If you are level 35 - 40 you run Nascar for best chance finishing high for good pay out.
If you are < level 35 you run races where theres a chance that level 40 drivers will get a lemon car and lose to you. (NSX, GTR class, Lemans events)
If you are < level 20 you want to run races were there will be 2 or more super cars this will increase your pay out Vs level 40 driver. (Audi R8, Ferrari)
Its done this way so that level 40 drivers will still be selected buy low level hosts as theres a chance of them losing.
Nascar is an even car event. So not all events have a wide gap in performance, Every car is the same performance in these Nascar events.
Car type is now removed form the results calculation.
This then relies on luck of the grid position plus driver skills in slip stream.
Like every single car make event does, even ofline.
Even with all that PD did to make it better for lower drivers, even when low level host pick events suited for low level drivers, % says that this will still happen......
Best driver in Best car starting first.... will result in a win, no way around it....