As @Sic said. Supply and demand. People have lots of Krono right now. We are about 6-7 months from a new expansion, which, if they continue in the same fashion they have, will raise the level cap to 130. That means new, more better, chase loot.
On my server, the most memoryforged desolation gear is being sold for 2M on the bazaar. Some of the better peices still see 3-5M.
So, when people don't need Krono to buy the things, then people can't ask as much if they want to sell them.