I don't have a problem with SBW signing with the roosters.
The NRL has put a 900k value on him ( aka 150k for 4 games ) which for a 34yr old is a little high IMO.
As others have said, Rapana and T'eo ( who was coming fresh from playing international RU for England) have signed for clubs and didn't attract any headlines because they don't have the pulling power of SBW. All Wolfpack players are available to NRL club's if they want them.
Good luck to the Roosters and SBW, don't think an over the hill player will have a huge advantage for them, but the viewers he'll bring to the game is a good thing for the NRL.