We don't have many CAGRO s because the cost is incredibly high. Last time I checked the Ayers Rock CAGRO was costing over $400k a year.
We don't have UNICOMs because they are next to useless as known traffic and weather can't be provided under the rules.
That's why Clive Wilson at Lord Howe no longer is listed in the ERS and no longer can provide a safe Unicom service at zero cost.