1) Quality private fishery 2) To enhance land value 6) To attract wildlife for viewing and/or preservation 10) To study aquaculture 11) To study all of nature and/or biology 15) To provide non-powered water sports (ie; canoeing, rowing) 16) To provide escape, peace, and relaxation (therapeutic or otherwise) 20) A family or personal challenge of actually building it 21) A family or personal challenge to maintain a complex ecosystem 24) A fun place to gather with family and friends