Use Patches to Judge Demand

When a new patch is going to come out, you can find the patch notes detailing the changes beforehand. This is a good chance to make some easy money. Look for items that are going to be changed (weakened or beefed up), or have their drop percentage decreased.

Let's say that the drop rate of Staff X is going to be decreased in the next patch. Go to the Auction House, and see if Staff X is up for sale. If it is, buy it! I don't care how high the price is. When they become rarer after the patch, that price will go up. This is especially true for Epic (purple) items. If Staff Y is Epic, and going for 500g, you can buy it, and probably sell it after the patch for 3 times that. This goes for any kind of item. Read those notes carefully!

On the other hand, if an item is going to be made more common through INCREASED drop rate, make sure you try to sell as many as you can before the patch comes out! Remember that blue weapon in your bank that you're holding on to until the price goes up? Uh-oh, it's being made more common in the next patch. Sell that thing now, even if you have to drop your price. Once more are on the market, the price will go down anyway, and probably by even more.

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