A lot of shit in this thread makes no sense at all mate. Suggesting that people have enough money to buy a 335d very makes them too rich to care about economy? Lol@you! That's akin to suggesting the 640d shouldn't exist then?
As suggested, it seems that the only logical reason is something to do with limits of torque or something. Maybe... Bt then it might just be the market.
If anyone honestly thinks that their 335 or 330 makes them a better person or somehow higher in stature than anyone with a 4 pot, then you need a good shoeing in my opinion to help you get over yourself. Your insecurities really need dealt with quite urgently if that's your attitude!
MY14 Space Grey F11 530d M-Sport