Two different things here and ANY solid bookmaker will tell you this.
Overnighters on MLB: in a game where it's all about the pitcher, it there's a Pitcher Change the line gets adjusted and all the written action is modified to the updated odds. This allows the bookmaker to BOOK and not gamble. When you're trying to offset your own numbers, you're not booking, you're gambling.
No vernighters for NBA or NHL:
In games like NBA or NHL, an injury blows the line out of orbit.
I don't even wanna start talking about NHL, which I don't know much of... but Bobby McBryde once told me I'd be better off PLAYING the pucks than DEALING the pucks. There are no square puck heads, imagine what they could do if they had access to an injury report before the bookmaker even gets to find out what's going on... instant LOSS.
The same for NBA... and just to make it really short and sweet, what would happen if Tim Duncan was in no position to play, just because the night prior to the game he ate a Migas Taco that fvcked him all up and he had the runs? Would the line be affected if SA came to play without Duncan? Would a player have an advantage if he knew the line was 2 points off, had he had access to an early injury report?
And that is very likely to happen, as local media reports faster than anybody. By the time the injury report hits the web, the line has been saturated.
The folks at Hollywood are BOOKMAKERS. And responsible bookmaking is to be appreciated. Part of that responsibility is decreasing exposure.
Before you even mention it: Why is Pinny different? Pinny bets, they might be on the action before anybody else.