User blog comment:TESClaymore/Skyrim Answers from Bethesda/@comment-64.213.229.174-20110901075436/@comment-71.113.228.19-20110901194249

Well they did say some perks couldn't be attained just by leveling up. Maybe smithing, enchanting, and alchemy perks operate differently. Like you have to find different ores, experiment with different combinations, and craft so many pieces.