The service will be free. Companies that subscribe will issue a website password to all their employees. Forensic will vet complaints and pass them back anonymously to member companies. The UK Public Interest Disclosure Act. Similarly we realize how hard it must be for suppliers to make profit under these circumstances.
Inducements cost the supplier in the form of reduced profit.
The reason they are offered is to try to beat the competition by unfairly distorting, influencing or eroding the impartiality of the buying decision making process. There is no such thing as free lunch so the buyer's employer will, one way or another, eventually finish up paying extra at the end of the day. A buyer should not have any personal interest in any supplier with whom business is being conducted. The confidentiality of information received in the course of work should be respected and should never be used for personal gain. Information given in the course of work should be true and fair and never designed to mislead.