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?
In gambling, if you don't have patience you'll lose. Applying that to the scenario given, I will not take the opportunity, why haste when I already have the strategy that can give me winnings. Little by little I can through patience and accumulation of winnings, I will be able to have a bigger bankroll. Why would I give myself a headache? Besides gambling is all about luck, anything that is successful strategy today can become invalid the next day.
I would accept the help if the condition is 50/50 or even 70/30 where the smaller portion is my share as long as I don't have any responsibility for the amount in case the bet lose.