The Worse team in baseball was the 1960 Mets( I think that was the year). But with an aggressive betting plan and no limits--the books lost taking bets on them) Same with any game---They only win with low limits!
I see you didn't think this through. Books know most of the bettors are morons and don't have a hope of beating the vig. As long as the book is bankrolled enough and uses sensible risk management then they can't lose.