It won't save him money if it doesn't fly like he needs it to. It will at the very least cost him time and frustration, and at worst will crash because he can't keep up with it. I've said it many times before but it bears repeating- the absolute cheapest way to do this hobby is to buy good, appropriate equipment and take good care of it. Trying to make something work in a role that it's not best suited for is a losing proposition every time.