I think that people wouldn't find it as readily. From a "the magazine is replaced every two weeks" standpoint, it would be easy to keep things up-to-date, so that's a good idea. I just think that it's easier for people to realize it's there with the separate card.
Cheers.
Makes sense. Maybe I have just been unlucky as the BoB card is never in my seat pocket. That said, my Y sample size is quite small, so it is very possible.