From the title I originally assumed you earned 1 BTC gambling, but either thats quite some earnings. How much exactly does an affiliate have to gamble to earn you 1 BTC anyway?
I also thought it would be that way, lol, yet he is really lucky to got 1btc from affiliates. Maybe he has referred a tons of high rollers. Really lucky. I cant imagine it would also happen to me since i am not good on gathering refferrals.