That is a real problem because 90% that join SFI they join because they think the can get a lot of money just by joining here and the only thing you can do it's just dont lie to them tell them the truth tell them that there is no money,there is no money without hard work and without spendind time,reading,asking etc...
And if he/she will understand that there it's no problem so just do you'r job explain to them help them if they want to stay they will stay even without your suport.
