The main reason I own a pond is they threw it in for free when I bought my house/land. Little did I know how much I would enjoy it...
1) Quality private fishery 2) To enhance land value 6) To attract wildlife for viewing and/or preservation 9) Swimming hole 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) 21) A family or personal challenge to maintain a complex ecosystem 22) To provide safe, fresh fish as food 24) A fun place to gather with family and friends