If you were told the outcome of a soccer match, hours before the match was scheduled, and you were assured that it would 100% win, how much would you be willing to bet on it? Assuming it was a 100% cant lose situation.
Please, disregard the notion that a bet is a no-lose possibility, that is not going to happen. There are best matches with the greatest chance that have lost and there are bets with the worst chance that won. Don't trust anyone or any match to that 100% extent, and no matter how sure you are, manage your risks accordingly.
Assuming you had millions of dollars that you could put on the match, where would you place the bets? Bookies often limit players. How could one successfully place millions of dollars in bets without drawing up suspicions or having their money frozen? Just curious.
Of course, they are doing this often, just don't use cash if your hands are clean, then it will all be between you and the house. Nonetheless, be certain of the credibility of the casino you are entrusting such an amount to.