Affiliate since: 12/31/1969, Power Rank: 99999999
"How do you show a prospect that there's money to be made as an affiliate with SFI?"
I would take him/her to the LEADERS tab and show him/her the different leader boards to show him/her that it can be done.
Next I would take him/her to the Testimonials section.
And lastly I show him/her my badges and tell him/her my story.
This should be enough to convince him/her that it is the real deal and not another scam.