Has something like this:
Player: So I'm casting Create Object to make 25 pounds of silver. This costs 4 energy, because I have skill 15, and gives us $25,000. We get $5000 each to spend.
GM: You know that it's not real money, right? As soon as they aren't touching it it vanishes?
Player: Yeah, but we just have to pay and leave before that happens. How would they ever know?
Ever happened to you?
I can help!