I carry a lot of programs for other reasons – so I am continually free to speak my mind because I depend on no one program. This is smart for other reasons too, and also, if you have the type site that has repeat visitors, you need to offer a variety.
But I think you missed the “bundling”.
A program is said to “bundle” when they throw all the casinos in one pot, and when you have a winner in one of them, your earnings with all of the casinos get wiped out.
Other programs practice “ring fencing”, where if you have a winner in one casino, it does not affect the income you have with the other casinos in this program.
When a program ring fences, I freely advertise all the casinos they carry.
When it bundles, it is financially wisest to only carry one casino from that group so to minimize losses.