I really think it gives a minor advantage. Check this game for instance... (66025250) the final quater. Don't know much about the stamina of both teams, but the home team (team A) didn't get his prediction right. Team B did get one prediction right, but still got outscored by team A in the final quarter to finally lose the game.
In the given examaple, the visitor team managed to win the first quarter, but no boost should stop a prolific inside attack against a mediocre inside defence. Given the ratings of both teams I think the boost may be too much, since 11 points seems very few, playing home, same effort.