As I said in a previous post...It's a business, money is involved, therefore the business (in this case a SL club) should be able to throw their money at whoever they want and be able to play.
It's been a tradition for so long for players in the NRL that are nearing their last years in rugby league to go over to the SL and play a couple of easy seasons for a nice tidy sum of money for a more comfortable retirement.
Also, these days it's getting more popular by the day for a young player in Australia to head over to England, and that should be fully supported.
Stuff the traditionalists who want only english players.