inb4 "no annoying commercial breaks"...
How come you, Stefan, don't advertise for products and companies you support?
For example, Joe Rogan does it for a few minutes in the beginning of each podcast, without interfering with the rest of the show.
It makes sense to start the call-in shows with a quick minute (half a minute?) of advertising for a specific product, or author, which you generally support, and want their success. This would be beneficial to them, and gain the show more funds.