I'll be the individual here and say I think it would be a stupid idea. I never really understood it. The only purpose a car like that serves is for race purposes and the wrx is not really a race car, nor do I think it would sell at all. The Lancer Evo RS did pretty poorly in sales and I dont see a wrx version being any better.
99.9% of wrx buyers are going to want power windows, power doors, A/C, etc.... Financially wise, it just does seem to be a smart move.