Man I guess I am in the minority here....I think there is simply no need for the ridiculous number of aluminum shafts. If you treat them the same as carbons, there is a shaft on the market for everyone, and a few sizes will cover all the bases. Front load if too stiff, want a lighter arrow go with less spine and lighter point. I have yet to see a bow that you couldn't find a carbon that flies beautifully close to the total arrow weight you want, (but I will admit I certainly haven't tried all the bows out there). Even the Osage selfbow CJ gave me shoots (gasp!) carbons wonderfully!
Personally, I don't think there are enough options in the stiffer shafts, I wish they made even stiffer shafts for those who like to shoot higher poundages, want high foc, and don't want to modify their riser.