Metal roofing is an upgrade to the standard asphalt material and a premium priced item. The cost is about double that of asphalt roofing and has about twice the life of asphalt.
A metal roof is a large initial investment with long lasting value. When your roof is a prominent visual item in the curb appeal of your house it is worth the added investment. Spend your money where it serves you best. You get the long-term value in added life with a better quality roof.