Yeah, it does happen sometimes... verrry rare. ISDN has made it easier. But it's such a tiny percentage. To say 'half' is ridiculous.
Many, many regional spots are done in home studios. I've done stuff for 'Peppers' furniture in Chicago, for example.
But I shouldn't have been so rude. Sorry, 'Chessrock'.... it was uncalled for. I apologize.
I used to do lots of crappy cable tv commercials in Michigan....
Holland, Manistee... I don't remember any other towns.
They always had 'M' something for the highway routes.... that's how I found out they were for MI.