What has gone by unnoticed, or perhaps I missed it, is that everyone in a pooled super fund (whether Industry or for profit) is taxed by the fund on unrealised profits every time the unit price is calculated. Even if your super balance is just a couple of thousand.
True the tax on unrealised profits is not sent to the tax man - I strongly suspect that less scrupulous funds pocket the interest earned on this amount.
It is done this way so people who are redeeming/moving to a different provider pay the tax due as if those assets were sold and the unrealised gains realised for tax purposes. Again interesting whether the fund or the entity earns the interest on these amounts.