I never gamble. Effectively what I'm saying is: polite way–"I'm so confident you're spouting rubbish that I'm will to risk €3000 of my money to prove you wrong even though I never gamble." less polite way–"Put up or shut up."

Also I'm from a neighbouring (check out how I spell neighbour for a clue!) EU country so a link to a US gambling site is no use to me. ;-)

In that case no sweat, take that bet, it is money in your pocket.