I have noticed a major dip in item price. Some, like the Katana (Yama love) I can explain, some make no sense to me.
The bots might be a cause but I am unsure how prevalent it was; so I can't compair the the gold flow then to what it is now.
*edit* As for sealeds, I've mainly switched to EIs. I base the price off of the sealeds though. It seems a good baseline.
Last time they opened I lost a lot of gold on the sealeds so the price is unpredicable right now. Going from 20k to 12-15k right after opening was a blow for lots of sealed vendors. The prices will be much cheaper this time around.