Nice one, @meno :-) Had me scratching my head there... But I think it's as follows: no one is scammed and the 100 dollar just changes ownership 3 times because of services rendered, it's payed forward, not accumulated (hence no need for 300 dollar). Everyone but the first man with the drivers licence ends up having nothing after having payed for the service and being payed for the service, they just lend the money from that first guy. He would have been scammed if the party would have been held in another hotel...
Right?
No?
Still head-scratching here... ;-)
Almost there.... hahahhha this is good, good for the brain!!