This is exactly why I registered mine.I think I'll register mine. The mobile phone companies want to be all over this spectrum, especially in urban areas where demand is high for wireless broadband.
I can imagine them being allowed access to the spectrum on the basis of not interfering with existing spectrum users. Registered stakes your claim to that status and will put a little dot on their network planning software that will indicate where a user is located.
I also use my C-band feed for work, so have an added stake in keeping reception clear. Thanks for the heads up.