I think the best way to prove them that this is legit and is really helpful to ua is to show them what you've got from doing this. The  statement that best to tell them is "invest bothig but just your time and earn big time".  Peoplw nowadays are afraid to invest because they might think is a a scam but when you tell them that don't need to invest  but thay can earn income and if you are really  an expert in here one day , you'll earn a lot.