There are only 28 cars due to over-management. Basically fans pay stupidly expensive $100+ tickets not just for big street races - even for humble races at road courses. This goes to give each car (or license) around $800,000 per season (anywhere from half to 1/6th of the budget to run 1 car, depending on the team/driver quality), it is not based on prize money as some of the lower end entrants badly rely on it. But do the top teams really need it? So you have fans paying through the nose, to prop up multi-million dollars business (that's dumb--why do Joe & Jill Smith & daughters need to pay so much for their family ticket, just to prop up Triple Eight who are rolling in money?) and moreover you have the field artificially restricted to a lousy 28 cars so each team gets more of the pie (that's worse) -- this is meant to be touring car racing, there should be 40 cars on the grid when possible like NASCAR IMO.
The cars are over-engineered: too many data engineers, too many sensors, shift cut, sequential, water brakes, dry ice, fiberglass panels, CNC machined just about everything, carbon fibre this and that... running the cars is just more and more complicated. They are losing the essence of it, the reason why they are restricted to a lowly 7500rpm and a low compression ratio - they are meant to be cheap, simple race cars like this:
Yet they only go 5-7 seconds per lap faster than an old Mustang or AMC Javelin, with no aero as such, driven by semi-retired racers -- that's embarrassing and rather naff.
Not to mention that only four cars have any chance to win, as everything is just so highly developed and refined, that others have little chance.
The drivers are generally well overpaid and sometimes there is little relationship to on-track results. James Courtney is the highest paid driver on a reported $1.3m per season, but you will rarely see him even make the top 10. If only that team (Holden Racing Team) would spend that on engineers instead then they might actually get half a result! But it is a free country and they can do as they please. Meanwhile to get a drive, a young gun on the other hand generally requires a large budget and/or the right connections. (The days of a Wayne Wakefield buying an old car and entering it in the Bathurst 1000 himself are long gone.)
IMO there is little comparison to golden days (say 1999-2004) when you had 40 cars on the grid at the Clipsal 500, with 55 cars on the grid at the Bathurst 1000, privateers were valued for their input and enthusiasm and could have a red hot go at the top races with many young drivers spannering their own cars, the cars were more simple (and much cheaper) and vaguely resembled their road going counterparts (a production-based rather than a fully fabricated chassis, good ol' h-pattern and so on) and all this contributed to more variety in the racing IMO.
haha what a whinge...