Honesty and firm hand is the best way to get your affiliates to approach their SFI business like a real business, you shouldn't give them any false hope or promises. You can share your knowledge and experience with them and if they want to work seriously they will listen every word you say. Most important thing is showing them your interest for their work as a sponsor, letting them know you are there for their questions and ideas, always acknowledge their work if it's done great.