Blondie brought up a good point - and quote from the JW literature explaining why they sold the radio station WBBR.
The real reason they sold it may be different though - I suspect that they made a good profit selling it - as the airwaves got more crowded, and the frequency they occupied became more valuable.
Anyway - as always - times change. Things change also. There is now FM in addition to AM - and also Shortwave (SW). The price to get on the air today would not be very much - and they could go low-power - if they wanted to do so - creating a network of localized low-power AM or FM radio stations to broadcast their message.
There are several problems with this, though - that pretty much make this impossible.
1) They would need to first apply to the FCC for the station license - and frequency - and location. This might take a while - but their 'religious' status might mean that they get a tad preference.
2) They would need to build the stations. While not a major project - it would cost dollars.
3) They would then need to staff this station. While it could certainly be automated today, they would still need a minimal staff to 'man' (or woman) it, and keep it legal per the FCC. This requires at least one individual (unless the FCC has changed their rules) with an FCC license - at least a Third Phone - if not a General Class license. Money. Education.
4) Once they are on the air - they need program material to broadcast. How many hours are they on the air? 6? 12? 24? One can broadcast the same drivel only so many times before it gets repeated. (A good example of this is a radio station that broadcasts 'oldies'. It repeats the same songs - daily.)
5) Many - most - radio stations use advertizing as income to support the radio station. (There are bills that need to be paid - electric - water - staff - etc.) Would they also play advertizing? Chances are - they wouldn't. That means that their income would need to come from other sources. Contributions?
I guess the bottom line is... it's all about money. Why pay a staff and spend dollars on something like a radio station when you can get the same (or similar) results using 'free' laborers. People who can be convinced that they MUST go door-knocking - spending their own time, gas, and incurring other expenses that come out of their pockets - all in the name of religion.
Regards,
Jim TX