When the subcarriers were deregulated in 1983, ours were marketed and leased for hundreds of thousands of dollars.

https://en.wikipedia.org/wiki/Subsidiary_communications_authority

“Subsidiary Communications Authorization” is the United States Federal Communications Commission‘s official designation for this type of service. SCA was deregulated in 1983; since then, both AM and FM licensed broadcast stations have been allowed to use subcarriers in the United States in general without requiring separate authority; authorization is only required for some uses which are still otherwise regulated, such as common carrier or Land Mobile Radio Service transmissions.^[1] The fidelity (bandwidth) of SCA channels on FM is generally quite limited compared to that of the main program material.”

This money went and goes, to our Foundation.