Now, if I were at his place, after have earned 15k$ from an idiot which is losing its kids, I would give back 1/5 of it as a loan. I know any human with some hearth would.
And the proof that you wouldn't just take the money and run would be? Just because you dropped $15k in a gambling site doesn't mean that the owner owes anything to you, including his trust.
So I suggest you to bet your money if you really want somewhere else. Maybe cloudbet I heard is good.
If your tactic is the same, I really doubt that CloudBet will give you a loan either. Plus, I believe they are two completely different games.