Personally, I'm a big fan of rules stability, which is what we have had in the Zetec series for the last three years (no changes in the car) I feel it is starting to pay off in bigger car counts which is great. Sure, that's not the total reason for that, but buying a car is a big deal financally for most people and it's hard to get somebody interested if they just spent 50K and then next year they will need to spend 5k for new bits, sidepods or wheels, etc.
Whenever I see "carbon fiber" "sequential gearbox" and "cheap" all in the same paragraph I usually get skeptical....
-Dave