What Trump is saying here is that so long as someone makes money for oneself, he ought to be rewarded handsomely, but if someone makes a lot of money for other people, he should not be rewarded commensurate to the increase in wealth generated for stockholders and bondholders. This is ludicrous.
I wonder if Trump's many real estate investment trusts ever compensate Trump or his real estate management firms for services such as collecting rents and finding tenants? I doubt Trump performs these services at a price that is below market, in fact I have no doubt he charges a hefty premium for the Trump name. Seems to me we have a case of the pot calling the kettle black.
To take Trump's argument the other way: if I am an owner of a firm, don't I have the right to pay my managers whatever amount I want? Stockholders are the owners of corporations, and the board is there to represent their interests. If a board is acting outside the interest of the stockholders (and I readily concede that many do) then I can easily divest myself of that stock.
I would much prefer to make these decisions myself than to have Donald Trump make them for me.