I've put a few hours into the game. Bought a crossbow for 8000 gold in the auction house, and then listed it for real money.

Congratulations on your successful auction in Diablo III!
Item name 1 Ranger's Hatred
Time of transaction 18 Jun 2012 02:39 PM PDT
Sale price $4.02
Transaction fee $1.00
Transfer fee $0.45
Applicable taxes $0.00
Your proceeds $2.57

Damn straight. I made $2.57 on a video game.