I don't think it really matters that they can't do it for their entire careers (although, there's nothing to say they can't at this point)... they're certainly in a position to do it now. It's rare enough that 3 brothers get the opportunity to play NRL footy together, they've probably dreamed about it since they were young. I don't begrudge them one bit for doing what they can to realise that dream, even if it is fleeting. Then again, a 4 year deal is hardly fleeting either. More than half the NRL is after either 3 or 4 of the brothers - they're definitely in a position to dictate terms at this point and their manager knows it.