Fantasy setting where there is an enforced upper limit on how much wealth and power someone can attain because if they get too much, a dragon will eat them and steal all their stuff.
Dragons like treasure hoards absolutely but they also looove to eat the rich. Trying to hide your wealth in various smaller deposits and behind false identities and the like doesn't work because it's magic, the magic still knows you have wealth/power, and the dragon smells it on you and decides you are tasty.
Being magical themselves, dragons don't actually need to eat. If nothing arouses their hunger they will just sleep for however long in their lairs, with their previously accumulated treasures all heaped up around them, maybe coming out once every few hundred years to breed or move house. Brave adventurers can try and steal treasures from sleeping dragons, but it's a risky move not because it's hard to steal from the sleeping dragon, but because if you succeed too well you will immediately start to smell tasty in their vicinity and they will wake up. How tasty you smell depends on how good of a thief you are, so it's a major catch, and there is a lot of speculation on what the max upper limit of wealth you can take from a dragon is before they'll wake up.
Rational approaches often don't work, however, because treasure that's been exposed to dragons for any significant length of time usually gets cursed. You might embark on the quest thinking you'll only take one or two golden goblets and be able to retire comfortably off of the resale, but then you get into the dragon's lair and your brain fries at the mountains of treasure and the next thing you know you're trying to escape with a trunk load of rubies and strings of pearls all wrapped around you and golden coin pouches weighing down your pack, and the dragon's eyes are opening, and, well. That's you done for.
Anyway, every now and again there's some aspiring emperor or proto fantasy capitalist who gets the idea of hiring dragon slayers to go kill all the sleeping dragons and rid the world of this menace, etc etc, but the only thing that wakes a dragon up faster than the smell of a tasty morsel is someone actually attacking them. So, it's never gone well.