Here's a link to InterNACHI's Legal FAQ Video:  Should Inspectors Pay Real Estate Agents to be on their Referral List?

Note: It is against InterNACHI's Home Inspector Code of Ethics to provide any "disclosed or undisclosed financial compensation directly or indirectly to any real estate agent, real estate broker, or real estate company for referrals or for inclusion on lists of preferred and/or affiliated inspectors or inspection companies." 

Refer to InterNACHI's article Home Inspector Ethics: Why Not Pay to Be on Brokers' Lists? to learn how to handle situations that may conflict with the Code of Ethics from this aspect.