It's not quick though.

To be honest, it's about 75% luck, and 25% Smart Trading. Like he said, the best chances are to bot your ASS off in Ladder, trade around and upgrade godly ethereal items, and save it ALL up for when Ladder Season ends.

Then, you need to wait a bit after Ladder ends for the flooded market to disperse and the price on Ladder godlies to go back up.