The primary aim of the Saudi government to finance the biggest stars in football is to bring immense viewership. Playing very well is only an additional reward. Fans and the media will be interested if big football stars are brought into the Saudi League. When they show interest, it implies many cable corporations all over the world will pay the Saudi League for the right to broadcast the matches.
At present, the Saudi League keeps on putting resources into bringing numerous football stars. However, there is something to worry about if these stars stay long, they are now rich and they probably would not consider extensions any longer very much like Benzema who is looking for an exit.