C-Span – make it more available

Currently, the availability of C-Span for cable viewers is limited due to its inclusion in higher priced option packages. Why isn't it in the basic option package on all cable systems? As cable captures 52% of the viewership in the US, there is still a sizable viewership over normal airwaves that would benefit from C-Span being available. Couldn't it be broadcast there also? C-Span is a non-profit public service set up by the cable industry.