Our green apple trees (3) are doing really good this year. I picked some smaller ones to encourage better growth of the others. I didn't even put a dent in the tree and in half an hour picked a good pile's worth!
I'd rather have a money tree in the back yard, but this works too!
Come over and get mine, they are falling off all over the ground right now because of the drought we are in.....I suspect it is a way for the tree to naturally protect itself.