applies to NFL as well
1. no player is worth a whole lot of points (depends more on role on team than actual stats)
2. like you said above, the other players on that team KNOW the player is out and step it up
3. players on the OTHER team know the player is out and tend to slack off a bit
4. the books adjust the lines for injury, not sure why the public sees a bargain on an injury team AFTER the line move, if anything the bargain is after that line move on the injured team. If there is not a line move when a player is announced out it is not b/c the books "are dumb".
5. I havent paid much attention lately, but last year I noticed that middles hit more frequently on injury games.