Not only that, but some companies' HR departments are best buddies with the headhunters and agencies. As a result, their candidates tend to be preferred (intent

Not only that, but some companies' HR departments are best buddies with the headhunters and agencies. As a result, their candidates tend to be preferred (intentionally or not) over the "refer a friend" candidates you refer as an employee. I know it's a serious accusation, but several years ago I had statistical evidence that this was happening at a certain company where I referred more than 20 highly qualified candidates at a time when they were struggling to fill positions.