When you consider who finances the races [yes we do, but we don't make the rules], why would it be in the TAB's interest to allow those it [indirectly] employs, to make things easier for the punter to pick winners with a simple and logical class system?
Sure they get their guaranteed % of all pools but if it was easier for the punter to pick winners there would be more of us doing so and that would lower average winning odds [a lot] .....which will turn punters away from the game and lower TAB share prices!