You're missing the motivation of ministries that buy radio time. The proverbial 'choir' knows they can go online. The remainder of the public finds them through other means. If you think about it, to have a successful website, you need to build awareness and the fast track to lots of awareness is still broadcast media. Many commercials on TV and radio are about getting the listener to the virtual storefront versus a physical location. Ministries buy time on radio (and TV) to do the same. Just like the business world, X number of members leave annually and you need fresh bodies to fill the empty spots and make up for the cash lost to make the budget. X is 20% in the radio business and that 20% is because businesses close, people move, people die, change business strategy, etc. Generally speaking it's a 'not the station's fault' reason for losing that 20% but a general natural shift found in business in general.
