Well in hindsight, I think even Arum knows that Pac is going to lose that match due to the judges. You can see his reaction when Pac lost to Bradley in their first fight which was also controversial. Arum raised hell during that time. However, when Pac lost against Horn, he did not even blink. He is just milking Pac until Pac hits retirement.
You hit it mate, this is why Arum is trying to make more money out of Manny before his retirement and this match can rake again millions-billion of dollars before Manny settles down and announces his retirement. But this fight is been awaiting by many boxing fans all over the world. Arum knows how to promote and even Manny loses on those matches, he can still make money.
Yes nothing to loose with manny if in terms of money. A lot of interviews, advertisment and higher offer for every match. But I'll still bet on manny if the rematch will happen.