Buy it low as you can before patch is announced, sell day of/after 1.05. It did the same thing before patch 1.04 - once players come back for 1.0.5 the price will skyrocket for a few days. I hope anyways, still doing my research & I only have been on the D3 market since a few days before 1.0.4. Got my DH to 60 - realized was not the right class to start botting/gearing as they are expensive as shit (4 pc nats ... GG XXX million) where I got my barb A3 WW ready for under US 5m.
Just takes patience looking in AH upgrading pieces by bidding, not buyouts (unless steal of deal / quick profit flip) - I got my OH for 5k gold. 275 strength, 758 LOH, 82 vit, & socket & MH 131 strength, socket, 45 crit dmg, 76 vit, 850 dps for 150k