Who buys mature Black Walnut trees?
Being from a lumber family I know that black walnut is considered black gold to the lumber industry. We had a neighbor who sold one like yours for 10,000 standing. They cut the trunk diagonally to make these huge table tops which go for thousands of dollars, and considering how many tabletops you can get from a large tree is a lot of money. Places like Missouri where black walnut are plentiful, you have too much competition but companies in Florida or New Jersey or some place where they are rare bring big bucks. Try advertising on ebay or out of state logging or lumber companies and you won,t have a problem getting a good price for it. good luck.