Its up to the individual I suppose. But the crap media hype over Origin, lead by that twat "thats an origin play" Gould, also has a bit to do with it. The players aren't all that smart. A lot get sucked into it. People get sucked into it. Say it often enough and people believe it.
I had plenty of respect for Meninga and Stuart as players. But this origin carryon and wroughting rules and allegiances ultimately I believe is bad for the game and bad for its long term future. Origin kills the NRL for about 6 weeks through the middle of the season and it kills the international game. It gets enormous hype and interest for the game which is good, but that good is offset by the bads.