You can repeat this technique as often as you like for some easy money. Because you've switched between areas, you can find the vending machine again and use the Possess skill for some more money. Grab that as needed, then exit the Hall of Heroes the same way you entered. A short distance inside, you can find some Salt. Collect the money, then enter the Hall of Heroes area. You can use the Possess skill for some easy money from that machine. When you approach the Hall of Heroes area, a couple of hours or so into the game, you'll notice a Dollar Bill vending machine.