Blizzard have released some additional info regarding the Diablo III Auction House. In case you weren’t aware, the Diablo III Auction House will allow players to buy and sell in-game items (probably looted from a demon that has yet to cool down) for real-world money or in-game gold. Part of the announcement is that Blizzard will be taking a cut of the action.
The fees that Blizzard will be charging will be listed when you put an item on sale so there shouldn’t be any surprises there. Any time that players sell an item, Blizzard will be charging a transaction fee, whether the item is sold on the in-game gold-based auction or the real world money auction. If you want to transfer the cash you have made out to a PayPal account, there will be a charge for that too.
There will be a flat transaction fee on equipment sold, 15% of the sale for an in-game gold transaction and a fee that varies by region (in the US the fee will be $1) for real money sales. Commodities like gems, dyes and other similar items will be have 15% of the transaction deducted for Blizzard, whether the sale is for cash or gold. Having payment made to a PayPal account or other third-party payment-service provider will see a 15% transfer fee being deducted by Blizzard.
According to the Diablo III Auction FAQ, “Also, any proceeds from the sale of items in the real-money auction house that have been sent to your Battle.net Balance will not be transferrable to the third-party payment service account.” It seems that going the PayPal (or similar) route is your best bet if you are actually looking to turn a profit from your questing.
Source : Ars Technica