Ever thought of turning the question back to them? It always works for me. I would say: Why would you refuse something that is proven to work that is bestowed to you free of charge?
SFI lets you expand your avenues of getting income. The money may not come like an avalanche but more like small streams that feed into a giant perennial lake. SFI exposes you to multiple income streams. SFI is open to everyone - rich and poor alike. TRY AND YOU WILL SEE FOR YOURSELF.