That type of referral indeed is mostly worthless (it might get you actually looked at by a human instead of rejected before that). Useful referrals are the kind where you go chat with your friend, figure out what they want in a job, then go find the hiring manager and tell them about this amazing ex-colleague who's a perfect fit for the role. That gets the candidate treated seriously. Sometimes it doesn't work out, but definitely gives the candidate a fair shot.
At a former employer, I sort of hated the referral ambassador or whatever it was called thing (with financial rewards attached I think). I always felt it encouraged quantity over quality. I actually sent a couple people I knew off on their merry way and suggested a couple others just go to the job site. On the other hand, I got several jobs through people I actually knew and had worked with in some manner.
