Yes what is gambling all about it's about taking risk that is what makes it gambling if you are sure about an event there is no need gambling on it again because the lesser the chances of winning the better for a gambler to bet on the game so I don't see anything wrong with someone gambling on an event that the probability of winning is slim.
Luck and chance is what gambling is all about even the normal football matches that we are playing there are matches that the winning options is not even up to ten percent and still yet people bet on it hoping that they can get lucky in the process