If you compare it to a successful independent film, consider "My Big Fat Greek Wedding". It had production costs of $5 million, marketing $19 million (most after word of mouth had already made it a hit), and generated $241 mil. domestically and another $127 mil. internationally, for a total of $368 mil.
Of course, the Passion of the Christ is not only the top grossing R movie of all time, but the top grossing independent movie of all time, generating over $600 mil world wide on a $30 mil production and $25 mil. marketing campaign.
The success of this movie on any level is almost entirely hype. It's a smash because Roger Ebert, Hollywood, and the left coast homo and metrosexuals decided that it was a smash, and they weren't going to let poor box office results stand in the way of it being declared a smash.
You are exactly right. Hollywood will NEVER release the marketing costs of this movie, it is pure propaganda and as such it is the agenda that matters, not profits.
Hollywood knows perfectly well how to make a movie that will be a blockbuster, but this wasn't designed to be one of them. That is why they did not use "A List" actors, etc.
Um Dude it cost 14 mil to make. I seriously doubt they've spent 80 mil on marketing.