Let the hive mind of Engadget get that for you.
"I've found myself using my PC for a lot of conversations lately, and I'm also considering recording a podcast to share with anyone who will listen. There are tons of USB headset / microphones out there, and I'm hoping someone has some solid recommendations based on experience. I'll consider both headsets and standalone mics, by the way, but I'd like to keep the bill under $100 if possible. Help!"
I think theres a few good reasons for that Ben. Not to mention making sure people have access to emergency alerts, this deals with how the radio spectrum is used, which belongs to everyone, so if you suddenly change up how it is used it's not really fair to shut certain people out just because they can't afford a new TV, they have just as much right to the airwaves usage as anyone else.