[Jasper]

One further thought is that bad events are nearly always a problem, but very often good events are unusefull due to circumstance. (e.g. gems, items, or militia you have no use for). In balance then the good events need to be more powerfull than the bad effects in order for them to have the same effect.

Another dichotomy is that bad events truly hurt early (e.g. losing a lab, temple, or population), while good events have less of an effect.

Plus the inherent unreliability of luck will always make it less desireable than Order/Produciton/Growth unless it's more potent, especially since it's effects don't scale with empire size.