How so? The reasoning here is: If you're earning $50 / month, the 20% commission results in a $10 commission fee. Since Pro Account is $9.99 / month and Zero commissions, a user earning more than $50 / month (and we have a few users approaching $100 / month in Beta) would make the financially reasonable decision to pay the monthly Pro Account fee instead and then forgo any other commissions.
"Maximize your earnings with a SuchFlex Pro Account"
Couldn't sound like a sketchier pay money to get money scheme if they wanted it to.