system
Given the following post, respond as if you're commenting on Reddit:
human
[D&D/Pathfinder] Why don't dragons rule the world?

Basically as above.  


True dragons are- by a pretty overwhelming margin- stronger, tougher, smarter, richer, more skilled, more magically capable, longer lived and generally better then basically anything else in the setting short of the Gods. There are very few beings that can take them in *any* conflict, from combat to rap battling (genuinely- charisma of 16+ and huge social skill bonuses across the board)  


So, why are they still sitting in caves eating sheep? Where are the dragon empires, or noble dragon kings? Where are the dragon mansions? Hell, where are the dragon *farms*?  


Why are the most powerful beings in the world content to sit in a dungeon and roll around in coins all day?
gpt
They don't want to, for the most part. They like caves. They tend to sleep a lot, so ruling isn't really feasible if you're going to disappear for 150 years. 

That said, plenty of areas live basically at the whim of a dragon, sitting in fear of the next random demand of sacrifice or gold. Why farm when the humans are already doing it for you?