Several reasons:
- Start of season hype dies down - people got their warlocks equipped by now.
- Less players, less demand - imo last weekend this forum had way over 2000 players trading in ladder forums on the weekend. Now its 1500? Less people, less demand
- I assume bot armies have been going at it by now as well. I heard there were banwaves tho so I am not sure whats the status there
- The more time to farm, the more stuff will be found. While 1-2 weeks ago lots of demand met scarce items, now its mellowing out a bit
It's not anybodys fault really...
it's the bot armies