I would reckon the best thing is to have it just as you would if it were real money. If you take big risks you can win big or lose big - If you dont bet at all you dont win nothing but you dont lose either. So I dont think a minimum is required each week to bet. I would also think this would make it tougher for you to organise trying to ensure everyone has a bet in on time. I am happy whatever is decided and enjoy a wee gamble especailly one that doesnt dent the old wallet! Looking forward to it as it will be good fun.