Generally, I think most RPG's are in the Fantasy realm because of magic. Without magic (or some variation like mutant powers, The Force, etc.), you have a smaller range of variety amongst player types. Most players would rather have a party comprised of a soldier/knight type, a magician/wizard, a healer and an archer (for example), than one that's just a mixture of long-ranged vs. melee ranged weapons specialists.
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"You can't shoot a country until it becomes a democracy." - Willravel
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