Nothing wrong with being a mark. As long as you don't take it to far. Hell, even a smark isn't so bad (you make money off of them too), as long as they keep some of their "inside (lol) knowledge" to themselves. Nothing I hate more then people who sit there watching a match and feel the need to inform everyone around them the name of every big move being performed. Or a wrasslers real name. Like I fucking care!
I think that in any form of entertainment (movies, music etc), fans can and always will take it too far. Maybe that's why some wrestlers/promotions make generalizations about (s)marks. Some nice words about marks would be appreciated but then again, the negative seems to make more of an impresion than the positive.