Is there a need small loan at 5%

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I was reading a book called the bankers code.it talks a lot about velocity and the ability to make an interest on small amounts of money . One example of how to do this was. To peer to peer lending but I thought of a new idea . For flippers I see on shows like flip or flop they can be short up to 5000$. But there partner or lender dose't want to give more. An they don't want to pay more. What if I as a private lender I gave a $5000 loan for 5% you pay two months after you sell. No collateral only promise  note an 500 down. IS THERE A Need