But yet it is done...
And yes a TAR would be great for Tassie I'm sure, especially since it would provide no benefit to the procedural towers and a top notch radar service for the three that go in at night. If you compare the cost per flight where the TAR would be used within 30nm, it might come in comparable to Melbourne if you drink enough bath water. To be honest, that would be the kind of thing the government would fund instead of something useful...