Sure there's more to it than that, but anything you see on a game to game basis is just random noise pretty much. It takes 8 full seasons for a pitcher's BABIP to stabilize in the majors, so you certainly shouldn't care about it in one start.
Would most likely only work on weekend games. So cut out 66% of the home games, down to 27 bobblehead giveaways. Could do one for every player on the 25 man! Bump payroll up to $50-$60M so you can be somewhat competitive.
Step 3: Profit