The first thing you need to do is impress upon them that this is a real business and not a get rich quick scheme. Let them know how long SFI has been running and how successful it is. Explain that if they were trying to set up an offline business they would need property and possibly staff.
As SFI is an online business these overheads are not required, but the business does not build itself. Building a business is a long process, but it is well worth taking the time to build it properly.