Marc,
Unlike bases, football is so overloaded with suckers that a book will *probably* have a chance to balance their action or get close and have the vig edge going in.
In baseball, the sharps all play, and play with more confidence. Very limited sucker action. Which means most sharps will play the same sides/totals.
Also, parlays are very good props 4 sharp baseball players.
It's tough to balance action when almost everyone only plays one side or parlayed.