For what it's worth - my two cents of opinion.
Firstly, no NZ race day ' pays for itself ' or 'covers its costs', however one wishes to phrase it.
To that end, the AWT's will be in the same boat - except that it wasn't industry money, for the most past, that set them up.
Yes, they provide somewhere consistent for work, that has to be a positive. However, not all horses like - or can cope - with the surface. Some cannot even manage being worked on the surface, and, here, locally, a magnificent training facility has been very harshly modified with the construction of the AWT. Now, training options are very severely reduced.
The policy seems to be to close down quite functional grass tracks to 'justify' the things, those horses are badly served indeed.
The closing down of tracks, in itself, increases the pressure on the remaining ones so of course you are going to see those reluctant to run trials, they don't want their grass hammered.
Cambridge has excellent facilities quite apart from the AWT, and there are still plenty of grass tracks left in the Waikato. The CD seems to have been poorly served in that respect, with closures, and years of under-investment in upkeep coming back to bite many - and those clubs, in the main, can't be held totally responsible for that under-investment. Policies designed to deprive them of their turnover share [ and I'm going back decades here ] in favour of the bigger clubs has left many struggling - and then the finger is pointed at them.
Here, in Canterbury, the closure of one excellent facility in particular has deprived locals of a very good trials track. The AWT does take up some slack in that area but, as the Chief alluded, the large entries at the remaining grass trial facility shows clearly what the preferred option is for most.
As for Cambridge - with the huge number of horses in training in the Waikato, to have to abandon a trials day through insufficient entries shows very strongly the opinion of most trainers there too.