http://www.cownetworth.com/kai-greene-net-worth/Kai Greene's net worth is $1.5 million. His "house" reportedly is in the ballpark of $700,000.
Quite a bit of prize money from these shows alone. With frugal spending, and a proper investment professional on the payroll, he could have easily turned this prize money into millions. Not to mention who knows whatever other kinds of ventures he has going on.
He probably lives off of his MuscleMeds / Magazine deals, and guest posing. Then hordes all merchandising and prize money and invests it all. Who knows for sure.
2007 Shawn Ray Colorado Pro/Am Classic – 1st
2008 New York Pro – 1st
2008 Arnold Classic – 3rd
2009 Australian Pro Grand Prix – 1st
2009 Arnold Classic – 1st
2009 Mr. Olympia – 4th
2010 Arnold Classic – 1st
2010 Australian Pro Grand Prix – 1st
2010 Mr. Olympia – 7th
2011 New York Pro – 1st
2011 Mr. Olympia – 3rd
2011 Sheru Classic – 3rd
2012 Mr. Olympia – 2nd
2012 Sheru Classic – 2nd
2013 Mr. Olympia – 2nd
2013 Arnold Classic Europe – 2nd
2013 EVL's Prague Pro – 1st