Answer:
In wealth I abound; in water I stand; as a fencer I'm valued all over the land; at Venice I'm famous; by farmers I'm prized; respected by law yet huntsmen despised; consternation and ruin ensue when I break; And the beasts of the forest advantage won't take.
Who keeps the ocean clean?
What type of house weighs the least?
What has no beginning, end, or middle?
I grow up while growing down
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.