You don't need your car until you need your car - i.e. you aren't driving to pick up groceries 16 hours a day. That doesn't make your car valueless. Likewise,

You don't need your car until you need your car - i.e. you aren't driving to pick up groceries 16 hours a day. That doesn't make your car valueless. Likewise, Linkedin isn't needed the majority of the time, until you need it - i.e. you're faced with having to find a new job in an industry where the right referral can translate directly into a job with higher income. That's not valueless.