I recently got an interesting email from a shadchan (matchmaker), which I've paraphrased here:
I have a potential match in mind for you. However, it is a halachic problem if I set you up with this person, since we have many members who pay to be part of our organization.
This person offers a subscription-based service (i.e., you pay on an annual basis to be a member of his/her "organization," which presumably earns you the right to be set up by these shadchanim). The email went on to detail the various pricing plans available for this service, and encourage me to purchase their "VIP service."
The shadchan also said that I can just "donate" directly to the organization through a payment processor (instead of signing up for the subscription) and they'd be happy to work with me that way, too. So it appears the "halachic problem" is resolved by payment, not by membership in the organization.
Is there any conceivable basis for the claim that "it is a halachic problem if I set you up with this person, since we have many members who pay to be part of our organization"?