Well it might make sense that luck dominion adds to gold income. Even the taxcollector gets lucky I guess, but doesn't that make your citizens unlucky? But the present big "bonus" of a Turmoil/Luck combination is the chance of getting a very good streak of random events. I often use this combo and while it's a real gamble I often get a lot of good effects. Then earthquake/hurricane/vinemen invasion strikes my major production/gold province.
Perhaps it would be better to make the random events slightly less random so that only a very unlucky dominion often sees the major disasters and only a strong luck dominion gets the best advantages more than once or twice?