Sorry I was being harsh there, but am I wrong? You can buy a M340i easily, and there's loads available second hand. A lot more workshops modifying them as well. How about getting parts for them?
Don't get me wrong, I'd love a 400R, even a 4cyl (I looked at a few V36s before buying my shitbox BMW). Sadly Infiniti died in Aus and we're stuck with importing them as niche vehicles.
Supply and demand