Let's say you lose. You don't have the money to pay me back. If you had the BTC1.5 to pay me back in a week, then you wouldn't need to borrow my money. If you win, then great. I have an extra BTC0.5. I'd say that since I have no reason to trust you that it might not be such a great idea to lend to you.
Was just gonna post something along this line.
If he can scrape together $25 to buy the 1.5BTC to pay back, then he could come up with $18 to buy 1BTC to deposit at SWC.