Why Are Mythic Prices So Low Now?

I saw a mythic for 7 stacks of le it used to be about 10-20 stacks. what happened?

 

How long ago did you see it cost 10-20stx

 

More mythics are added to the economy over time. When Gavel first came out, mythics were effectively one-of-a-kind. Having a mythic was incredibly rare and special. Unsurprisingly, that didn't last for a terribly long time; before too long every rich player had at least one. The longer mythics existed, the more of them there were and the less rare (and therefore valuable) they became. Once a number of good loot runs were found, even moderately wealthy people could afford them. Once loot quality was added, the number of mythics someone could find skyrocketed. Instead of 10 mythics being an insanely high number only a handful of exceedingly lucky players managed to find, it became far less shocking if you lootrun regularly.