You were experimenting with sports betting and found yourself profitable with your strategy. However, you can’t raise a bigger bankroll to generate larger profits. Then there’s this one guy who believes in you and is willing to lend you money, of course, with interest, almost like a loan shark rate. The question is, would you see this as an opportunity or just a trap?
You don't use interest or borrowed money for gambling instead you use your personal income, without having a steady personal income you are to avoid gambling because it will keep making you to borrow until you will start selling your properties that will not even be enough to upset the debts you have incured.
As an adult gambler you don't need people to tell you what and how to deal with your gamble life because any you are old enough to take decisions on your own, and so you don't have to allow anyone to push you into what is not comfortable by you and how sure are you that your strategy will work, what if it fails and all the borrowed money is gone will the lender accept not collecting the money back from him.
Manage your resources so that you will be not end up being an addicted.