There are probably also licensing/contract issues. Most of the talk channels are not available via mediums other than the satellite reception itself. Until recently, talk channels weren't available on Sirius online streaming either.
The issue seems to be that Sirius has contracts with the talk talent, including Howard. If Sirius is going to be distributing to a new medium, of course the talents are going to want a piece of that extra revenue, which requires contract re-negotiation etc.