Most people join SFI thinking that they'll get rich quickly with a minimum of effort, but lose interest when they discover that it is a REAL business requiring time effort and perseverence to succeed.
I believe that only about 1 in 30 people who sign up for SFI realise it's enormous potential and work the business, and although this does not sound a lot, remember that with only 5 active affiliates in your downline, you have a thriving business.