You might need some more information to determine if this is a good deal. Are all bets 11 to 10, or do you have to bet a minimum amount to get that? Are the spreads the same for both the favorite and the dog, or do you have to give, for instance, 6 pts to take the favorite but only get 5 pts if you take the dog? Answers to questions like these would affect whether the 30-30-30 is a good deal.