I've changed my trait-file some weeks ago. IIRC there are Triggers for 50'000, 100'000, 150'000 and 200'000 mnai treasury. Everytime the chance is higher to get some of the bad traits, like Lover of Beauty. But I think the majority of this traits comes from different things. A big and well developed city increases the cance of getting corrupt, lazy and other bad traits, while beeing in a small town makes your FMs more spartan.
IIRC having high taxes also raises the chances for corruption, getting lazy, etc. so high taxes don't make you richer just because of the traits of the FMs.
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