Why do dragons love gold so much?
Here's one comical explanation from a webnovel I read:
"Only after becoming a dragon did he truly understand why dragons loved gold.
Most dragons were warm-blooded creatures, and their body temperature was extraordinarily high. Whether because dragon blood burned too fiercely, or because the magic coursing through them was too intense, most dragons lived in a constant state of oppressive heat.
Gold conducted heat extremely well, so lying atop it was genuinely pleasurable for dragons."
-Lich for Hire Chapter 132