Costly
While it'd be nice to have live coverage for the national champs, you have to remember that the Tour Down Under only has live coverage for a couple of stages.
I could be wrong, but live coverage of road cycling is pretty expensive, given you need a helicopter both for aerial shots and as a relay for the moto cameras.
There's also unlikely to be much international interest in the race, particularly as it's on in the middle of the night in Europe.