Who gives a crap? Who would actually expect you to hand out your $100 bills?? Or ANY amount of money for that matter. I don't think they'll assume the bills are gaffed just because you didn't hand them your fortune. You can hand out most of the bills in Extreme Burn. Anyone who is picky enough to actually check every bill doesn't need to be shown magic, because they don't appreciate the magic of illusion. Extreme Burn looks a lot better anyways, like REAL magic.
You don't hand out money to complete strangers unless you don't mind losing that money....period.