Come on people, if you want banner crops year in and year out, buy fruit at the store. Fruit production is highly dependant on climate/weather. Weather is fluid...so what your trees will do from year to year will vary. By the "chop it down cause I didnt get a million fruit" theory, nobody would be growing fruits of any kind.
Oh, 3, 4 and even 5 year old trees, still in the juvenile stage.