You are talking about 2 completely different "concessional" rego schemes.
One is for equipment that is primarily NOT used as a vehicle/conveyance on a public road, but has the
occasional need, as a
secondary usage, to travel on public roads or in public spaces - like council lawnmowers, bobcats, excavators, tractors like yours, and other farming equipment. They can also be brand new items, or under 30 years old, and so not have restrictions on the number of times they can be used in a calendar year.
30+ year old cars are still primarily a passenger conveyance - that's their role. It's not a secondary role like an item of equipment - it's their primary use.
If you allow $50 rego on anything over 30 years old, then you'll simply end up with a whole lot of 30+ year old shitboxes abusing it for cheap rego (just like what happened in VIC under the initial poorly managed club rego system - people driving VN commodores to work each day on the logbook). This is not the goal of the system.
Historic rego is for the preservation, maintenance & enjoyment of classic & historic vehicles. Read that line several times over. It's not for allowing cheap rego for old cars.
History already shows that if the system is not governed properly, it WILL be abused, and has been. The NSW system is not hard at all, and was very well thought out & enacted, with lots of consultation with car enthusiasts who also don't want to see it abused.
For a $950 saving in rego/greenslip, perhaps you should let go of your hang-ups about clubs and just go join one. There's plenty out there:
http://www.rms.nsw.gov.a...storic-vehicle-clubs.pdf