Where did this $24 number come from? It's free to sign up and bid on projects and we charge a 10% commission for freelancers on a free plan only when you accept

Where did this $24 number come from? It's free to sign up and bid on projects and we charge a 10% commission for freelancers on a free plan only when you accept. What's wrong with a fee to make a project featured? Ebay does this. We charge for tests so people don't game them by writing down all the answers.