In terms of the game indeed Serie A looks boring but from the boring game, gamblers can take a lot of profits because they always win bets. Why is that? Because various matches in Serie A are very easy to predict.
If you are talking about bets regarding Juventus I think that its a given but your statement isn't true for the whole Serie A league. Every year you will see 7-8 teams battle it out for the 2nd until the 4th spot and all of them only have 5-6 point differentials which is only 2 winning matches to catch up. If you are talking about game league predictability Serie A isn't one of them because I don't see how the rest of the teams has an edge on one another since they are pretty even in terms of competition.