C'mon now. While it is *possible* they are falsifying bills, it's highly unlikely that Marriott is willing to take the huge risks involved with such a scam (as well as the cost of losing customers) for such a small theoretical gain. It's much more likely that such charges are the result of poor accounting or technical glitches, such as the ones suggested in this thread. A problem that should be improved/fixed? Sure. A purposeful falsifying scam? I doubt it.