radioman said; "That's more than I thought."
Here's why there are so many. Local radio (miniature wgn's in small towns) is quite dead.
Brokering is a way that owners, with only business degrees and no programming skill - can make a good (serve a public need) , reliable (my boss used to say, "If they show up without the money, don't let them on.) , fast (lots of brookers pay cash) way to run things with only a board op at the helm. NO demanding loudmouth salespeople or announcers, therefore LOWER expenses.