In SFI business the accumulation of versapoints determine our efforts and dedication to earn our rewards .So in SFI yes you can be successful without investing any money but with hard work
That means you need more downline PSA, with that you can also maintain your status by getting VP versapoints from them, but if they become EA2
You can also get more each month if some of them become BTL, STL etc so that you can earn more salary
All the best