Now if you knew which numbers were selected less frequently than others, and you kept that information to yourself and you bet on those numbers that were selected less frequently, then unless there's any special reason why those numbers should produce fewer score draws than other numbers, you're giving yourself an advantage because on the weeks in which those numbers produce score draws there are fewer people who'll have them down as their numbers, and so there's more money around for those few people who have them down, including you, and so if you win, then you'd expect to win more money.