wont it be more natural to have a system were the karavan is worth less gold each time the caravan is killed?
E.G. After three kills you get 700 for killing a caravan.
this may also be combined with the system of increasing the gold amount of every round the caravan makes?
E.G. After three kills you get 700 for killing a caravan, so the caravan goes 3 rounds and increase the amount of recourses, then you kill it and the amount you gain is 850.