The ones I hear do 3-4 ads for 2k-5k USD each, IIUC. Marco Arment even said that Squarespace alone practically financed many podcasts for the first years of this "podcast boom".
I also feel like Rogan won't put up with bad sponsors or vouch for dodgy products because I'm familiar with his personality and some trust has been built up over the time I spent listening to his interviews. Perhaps that's the key.
But if you happen to interrupt the podcast with some techno-music advert and have someone talk about a sponsor or some completely unrelated product, that's not cool at all.