I've been reading how some people are just farming planets to gain merely the tax income, barely worrying about the level of morale the people have. Thus exploiting the economy of the game. Let's face it slaves do not produce as much to a civilization as a well balanced well organized unit. We're talking about the future here and slavery should be something that is long past, but, of course if someone wants to be a tyrant in the game, just make them not get paid dearly for it.
My suggestion is that Taxes and Morale be tied together. At 50% morale you only get 50% of the tax income, that'll fix those exploiters.
If Taxes and morale are already tied together then nevermind. heh