If you look at the sales of the Sti compared to the base model Impreza R, I am not sure if they are making money.
When Subaru is selling something like 100 impreza R's a month compared to maybe one or 2 STi's. It's not a great investment for a manufacturer. (This is just a rough guess of WA btw)

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2000 Mitsubishi Evo Tommi Makinen - Diamonds are a girls best friend.
Tokyo Motorsports - www.tokyomotorsports.com.au