Companies do provide referral bonuses in which a person can refer his friend or a relative for any available position in his company but that referred person have to apply for that position and submit his resumes and this is very helpful to get a job in a company. Companies do pay to provide suitable references to the company for certain positions.
CRO industries do provide referral bonuses and it depends upon the position you are referring for and the bonus increases as you go up from the project coordinator position to project director level. These referral bonuses also include in the yearly bonuses by referring just one person and it increases as the number gets bigger. Employees can utilize these bonuses for their vacations.
Companies prefer their employees to bring their own references and friends for the job because they know that they will work together in a more productive manner, there will be good team work and they will also stay longer in the company.
Referring people for the job positions also increases your network as you get connected to the people you are referring. This network can prove very valuable in order to be aware of the surroundings and rising opportunities.