Perhaps Mark Cuban was right - the Spiderman plan was purely about generating publicity. Merely announcing that logos would be placed on the bases guaranteed millions of dollars of publicity for the movie. But does MLB have to lie about it? From Ron Rapaport:
MLB said the promotion was geared to kids as young as 6, but the film, Steve Zipay of Newsday notes, is rated PG-13. Of course, if MLB really wanted to increase interest among youngsters, it might consider scheduling the playoffs early enough for them to watch.
Good point. I can live with commercialism in baseball - its been integral to the game for a century - but let's be honest boys.