NBA Parley Cards

Alright guys, so I know a fella who runs the NFL cards and is branching out to NBA cards to continue his little soiree for a few extra months. I told him it was a bad idea because he only prints the cards for the weekend games and these teams are playing throughout the week. If one guy gets hurt in a weekday game that can swing a point spread from a team giving 5 to getting five in the weekend game. Does anyone have any knowledge on if the bookies get screwed by cards like this? Thanks.