I'll tell ya why..........because of the feeling you get from accomplishing something thats VERY challenging! And if you think that sim(and I love sims) is even gonna come close to that exitement......you need to fly the real thing! An actual RC flight for rookie pilots is a rare,very nervracking experience. One you'll never get from just a sim,and also one you wont forget. An actual succesful flight will put a smile on your face you dont get very often in life(because of the challenge). At least that how most of us feel,and if you dont,RC flying isnt your bag.