So I just sold a 4* sword in under 12 hours on the auction for 200k. Faster then I thought. So then I decided to do some math...
At 6k/100 energy, it costs ~96k Crowns to make a 5* weapon, plus recipe/heat costs.
4* is ~40k + recipe/heat
So, are the additional costs of my 4* sword really worth 160k crowns to someone? What value is put on time/heat? *shrugs*. Somewhat rhetorical but figured I'd post it.
It's also about rarity. Right now you can't get a lot of four and five star weaponry in the auction house and some people find that appealing.