Here are some numbers from this New York Times article:
* SNY is believed to make at least $260 million/year from subscriber revenue (ad revenue is not mentioned)
* SNY nets about $120 million (Sterling Equity would get 67% of this)
* SNY pays the Mets between $60-70 million/year
If this is accurate, and I'm reading this correctly, then the New York Mets and Mets' ownership receive $140-150 million/year from SNY.