User blog comment:Tony 1998/What Do You Want To See in GTA V's Story Mode Update?/@comment-5229816-20140122173648/@comment-809585-20140122175046

The use of RSC bonuses without an internet connection would be VERY difficult to do, your online account needs to be connected to be established for bonuses.

The only way to do it would be to simply have the bonuses without the use of connecting your account, but it's most likely to also encourage players to be more sociable.